Opk and bbt don - For most women, the answer is no. LH rises to tell the body that it is time to ovulate and surges 24-36 hours before the release of an egg. If you don’t see this surge, you probably took the test at the wrong time, ovulated early or late, or are experiencing an anovulatory cycle. Rarely, however, your baseline LH level may be high or low ...

 
10 – 12 percent chance of conception. 5 – 6 days before ovulation. 0 – 5 percent chance of conception. The most important thing to note here is that you can conceive anytime during the 5 days before ovulation and on ovulation day itself. Within your 6-day fertile window, the 2-3 days before ovulation are your most fertile.. Wwe women

Ideally, you should use one that is accurate to 1/10th (98.6) of a degree if you measure in Fahrenheit or 1/100th (37.00) of a degree in Celsius. Use the same thermometer throughout the cycle. If you buy a new one, start using it on day one of the next cycle. Taking your BBT is not too hard.Nov 1, 2018 · 10 – 12 percent chance of conception. 5 – 6 days before ovulation. 0 – 5 percent chance of conception. The most important thing to note here is that you can conceive anytime during the 5 days before ovulation and on ovulation day itself. Within your 6-day fertile window, the 2-3 days before ovulation are your most fertile. Mar 12, 2018 at 5:30 AM. For the last year I have always used the dollar tree test. They always work perfect with no fail. In January I tried the clear blue easy digital along with my cheap ones and that was the first month ever that I didn’t ovulate. I had 10 days of flashing smiley faces.It looks to me like, according to BBT, you O'd on the 2nd of Nov. But the OPK says the 4th.. I think. If it was the 2nd then you may not have BDed within the time frame. When I was trying for my daughter 10 years ago I went by BBT and thought it was pretty accurate. I have heard the OPKs are really accurate, too, though so I don't know. Hiya, so I’m 7/8 dpo today… had positive opk on 17th and I had ovulation pain the same day so That’s why I say 7/8 dpo opk was negative the next day. I don’t check BBT but my Fitbit app shows a temp dip on 17th and then rise too.Are you taking your BBT its the only real reliable way to tell if you have Ovulated. But if your getting highs then I would just keep having sex and hoping that you catch O even if you don't get a peak. I'm really sorry this is so frustrating for you. Jan 6, 2020 · I was diagnosed with endometriosis and pcos. I started metformin last month, used provera to kick in my period then letrozole on cd 3-7. FF had marked cd 10 as my ovulation but that is way too early for me. My typical cycle is more or less 45 days and I ovulate somewhere from cd 25 onwards. But my BBT have been up. Ideally, you should use one that is accurate to 1/10th (98.6) of a degree if you measure in Fahrenheit or 1/100th (37.00) of a degree in Celsius. Use the same thermometer throughout the cycle. If you buy a new one, start using it on day one of the next cycle. Taking your BBT is not too hard.Ovulation usually occurs about 14 days before your period. Your LH surge occurs a day or two before that. So knowing how long your cycle is (from one period to the next) will help you figure out ...Hi all, I'm new here. I'm almost 35 and we've been TTC for 9 months. We usually BD the few days before I get a positive OPK, the day I get a positive OPK, and usually the day after. Well, I started temping 3 months ago and realized there are 4-5 days between my positive OPK's and my temp shift. So when... The OPK method is even more powerful when combined with the basal body temperature (BBT) method because the two methods together create an “ovulation sandwich.” (Check out my post on the BBT method for details on how to incorporate it into your ovulation tracking activities.) Since the OPK method gives you about 1-2 days’ notice prior to ...Cara Guna OPK: boleh start check 2-3 hari selepas period. untuk yang jarang period, disarankan buat BBT (*cara buat BBT ada kat bawah) untuk period yang regular, formula kiraan cycle period – 14 = hari dijangka ovulate. Jadi mula check OPK 2-3 hari sebelum tu. kena check OPK sehingga -ve semula selepas +ve.I was diagnosed with endometriosis and pcos. I started metformin last month, used provera to kick in my period then letrozole on cd 3-7. FF had marked cd 10 as my ovulation but that is way too early for me. My typical cycle is more or less 45 days and I ovulate somewhere from cd 25 onwards. But my BBT have been up.Aug 24, 2019 · Haha! Don't even ask when I start xmas prep. Still camping but I lost my group for a bit. My temp was pretty consistent this morning. I missed my alarm but the birds woke me up. Using the OPK in the camp bathroom was an experience but it was darker from the day before though still not a clear positive. CS/Q: I'm glad I started temping and using ... I got my bfp yesterday (yay!!) and If I'm reading my opk/bbt chart right, that's 10dpo. That seems early... does that mean I'm more likely to have twins? Or am i reading it wrong, and I have my dpo wrong? i had a cp last cycle so I'm not sure if that made it wonky.photos: my bfp from yesterday, my bbt...Ovulation predictor kit (OPK) Ovulation predictor kits look just like the home pregnancy tests but they determine when you are ovulating instead. Unfortunately, different brands vary in their accuracy. If you are finding positive tests with the regular "pee-on-the-stick" kind, then you don't really need the fertility monitor.Jan 6, 2020 · I was diagnosed with endometriosis and pcos. I started metformin last month, used provera to kick in my period then letrozole on cd 3-7. FF had marked cd 10 as my ovulation but that is way too early for me. My typical cycle is more or less 45 days and I ovulate somewhere from cd 25 onwards. But my BBT have been up. Even with a slow rise, a temperature pattern usually becomes apparent after a few days. It can be helpful to consult with other fertility signs such as cervical mucus and cervical position. Ovulation is most likely to occur on the last day of fertile cervical mucus. But with a slow rise it can sometimes be difficult to pinpoint the exact day of ...Mar 12, 2018 at 5:30 AM. For the last year I have always used the dollar tree test. They always work perfect with no fail. In January I tried the clear blue easy digital along with my cheap ones and that was the first month ever that I didn’t ovulate. I had 10 days of flashing smiley faces.Hi All. Husband and I started TTC mid oct 2017. Came off oral contraceptives in 1st week of Oct 2017. Have started using OPK and BBT this cycle (currently on cd16 and last cycle was 29 days, previous cycle was 23 days) but still havent had a positive OPK result (clear blue pink tests) which i check first thing in the morning as the pack tells you to.I was diagnosed with endometriosis and pcos. I started metformin last month, used provera to kick in my period then letrozole on cd 3-7. FF had marked cd 10 as my ovulation but that is way too early for me. My typical cycle is more or less 45 days and I ovulate somewhere from cd 25 onwards. But my BBT have been up.Aug 30, 2019 · Women who ovulate and check their basal body temperature (BBT) chart will probably notice a small, but sustained rise in temperature after ovulation, especially after a few months of experience with close monitoring. A woman who is not ovulating will not have that small temperature change. Tracking BBT in addition to cervical mucus can be helpful. Ovulation test strips are urine tests that you use at home to detect impending ovulation. They work by detecting the luteinizing hormone (LH), which increases to prompt the release of the egg during ovulation. Sometimes they are called ovulation predictor kits (OPKs), or simply ovulation tests.A BBT spike (or progesterone testing) will show that ovulation did actually happen. So it's possible that while you're getting a positive OPK, you may not actually be ovulating when you think you are. If you do eventually get a BBT increase, it could mean that your body is trying again and successfully ovulating the 2nd time.Mar 12, 2018 at 5:30 AM. For the last year I have always used the dollar tree test. They always work perfect with no fail. In January I tried the clear blue easy digital along with my cheap ones and that was the first month ever that I didn’t ovulate. I had 10 days of flashing smiley faces.You don't O on the day of a positive opk. It's 12-36 hours after the positive opk, so that's the reason for the low temps for now. Sometimes you can get a positive opk and not O.Hi All. Husband and I started TTC mid oct 2017. Came off oral contraceptives in 1st week of Oct 2017. Have started using OPK and BBT this cycle (currently on cd16 and last cycle was 29 days, previous cycle was 23 days) but still havent had a positive OPK result (clear blue pink tests) which i check first thing in the morning as the pack tells you to.Nov 11, 2017 · I've been reading online that some women don't get their temp rise until 3 or 4 days after a positive opk. Praying this happens to me. Plan on continuing with OPKs and bd'ing every 2 or 3 days ... Mar 12, 2018 at 5:30 AM. For the last year I have always used the dollar tree test. They always work perfect with no fail. In January I tried the clear blue easy digital along with my cheap ones and that was the first month ever that I didn’t ovulate. I had 10 days of flashing smiley faces.Oh and by the looks of things, you don't necessarily need a BBT but I've really loved having more accurate charts. :) I got my Life Brand BBT at Shoppers Drug Mart. I change them every 3-4 months so I can rely on my temps being accurate. I don't use a new BBT until the next cycle though.Advertisement ... Ovulation predictor kit (OPK) Ovulation predictor kits look just like the home pregnancy tests but they determine when you are ovulating instead. Unfortunately, different brands vary in their accuracy. If you are finding positive tests with the regular "pee-on-the-stick" kind, then you don't really need the fertility monitor.Every cycle I have been able to measure the LH surge, and also the temp increase when I have ovulated and drop in BBT when AF is arriving. My FP/Ovulation has been all over the place though, so literally I measure OPK 2 times a day just to make sure I don't miss it. The range has been 18-37 days for ovulation - yup, that's a lot of OPKs!Yes absolutely. If you took the photo 4 times it would probably spit out 4 different numbers 😂 realistically the numbers don’t mean anything, all you’re looking for is a positive OPK, where the test line is as dark or darker than the control line. It looks to me like, according to BBT, you O'd on the 2nd of Nov. But the OPK says the 4th.. I think. If it was the 2nd then you may not have BDed within the time frame. When I was trying for my daughter 10 years ago I went by BBT and thought it was pretty accurate. I have heard the OPKs are really accurate, too, though so I don't know. Jun 20, 2022 · Personally I do both. Opk predicts BBT confirms. Of the two I like bbt more. I don’t find it difficult at all, but I’m still ttc#1 so no one wakes me up at night. Just set an alarm for the same time every morning and keep the thermometer and your phone or a pencil beside the Is Your BBT More Accurate Than An OPK? Experts Weigh In Life Manuel Findeis/Fotolia Checking Your BBT Versus Using An OPK — Which Is More Accurate? by Caroline Shannon-Karasik Oct. 14, 2017...1. Changes in basal body temperature (BBT) Your BBT is your lowest body temperature (your body temperature at rest) in a 24-hour period. On the day after you ovulate, your BBT will go up slightly, by 0.5 to 1.0 degrees Fahrenheit. It will stay elevated until your next period. It may also dip slightly just before the increase.Bbt Spike But No Peak Fertility On Opk. K. Karter2013. Mar 23, 2015 at 10:39 AM. I have been TTC since December and still no luck. I started temping this cycle and got a big temp spike this morning. I am using clearblue advanced opk's and I have only gotten two flashing faces which means high fertility, but I haven't gotten a peak fertility yet.My bbt dropped this morning and Iv had ovulation pains all day, so that would predict that Iv ovulated today- as long as I have a temp rise tomorrow which I’m expecting going by last months chart. But on my clearblue opk Iv got flashing smiley no static yet. If it goes static tomorrow that will say ovulation within 24-48 hours.Between oversleeping one day, some sleep deprivation, heavy drinking one night, indiscernible OPK results, and using the least-adored BBT on TB, I'm basically just crossing my fingers at this point. Thought the temp would go up today for O yesterday but it went down so I'm hoping O today for pretty good timing. EWCM is not an indicator of ovulation, just that it should be happening soon. 2. It could be seminal or arousal fluids if you have BD in the last 12-24 hours. Most women know this but its worth saying as most couples tracking CM are also BD regularly around the time they think they are going to ovulate. 3.14K subscribers in the TFABChartStalkers community. Business, Economics, and Finance. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX TeslaThe OPK method is even more powerful when combined with the basal body temperature (BBT) method because the two methods together create an “ovulation sandwich.” (Check out my post on the BBT method for details on how to incorporate it into your ovulation tracking activities.) Since the OPK method gives you about 1-2 days’ notice prior to ...Jul 17, 2022 · OPK or BBT? Curious to hear others experiences when they were TTC. I have been doing both OPK tests and measuring my BBT for several months and I’m noticing that I’ll get a positive OPK but then my body temperature won’t spike for sometimes up to 4 days later. It looks to me like, according to BBT, you O'd on the 2nd of Nov. But the OPK says the 4th.. I think. If it was the 2nd then you may not have BDed within the time frame. When I was trying for my daughter 10 years ago I went by BBT and thought it was pretty accurate. I have heard the OPKs are really accurate, too, though so I don't know.Aug 30, 2019 · Women who ovulate and check their basal body temperature (BBT) chart will probably notice a small, but sustained rise in temperature after ovulation, especially after a few months of experience with close monitoring. A woman who is not ovulating will not have that small temperature change. Tracking BBT in addition to cervical mucus can be helpful. 10 – 12 percent chance of conception. 5 – 6 days before ovulation. 0 – 5 percent chance of conception. The most important thing to note here is that you can conceive anytime during the 5 days before ovulation and on ovulation day itself. Within your 6-day fertile window, the 2-3 days before ovulation are your most fertile.Sep 16, 2019 · BBT rise day before positive OPK. March 18, 2023 | by lliiivvii1112. I’m on cycle 7 trying to conceive baby #1. My BBT was raised yesterday (98F) and I hadn’t got a positive OKP yet so I figured I missed my peek. Because I’m curious I continued taking OPKs and got a very dark positive this morning along with... Ovulation predictor kit (OPK) Ovulation predictor kits look just like the home pregnancy tests but they determine when you are ovulating instead. Unfortunately, different brands vary in their accuracy. If you are finding positive tests with the regular "pee-on-the-stick" kind, then you don't really need the fertility monitor.Oct 29, 2022 · 14K subscribers in the TFABChartStalkers community. Business, Economics, and Finance. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla I got my bfp yesterday (yay!!) and If I'm reading my opk/bbt chart right, that's 10dpo. That seems early... does that mean I'm more likely to have twins? Or am i reading it wrong, and I have my dpo wrong? i had a cp last cycle so I'm not sure if that made it wonky.photos: my bfp from yesterday, my bbt...If your ovulation test is positive, this means that your LH levels are above the threshold considered to be “surging” – meaning that ovulation will likely happen within 24-36 hours. At rest, typical LH levels for women are between 5-25 IU/L, and during the LH surge, they can peak up to 100+ IU/L. The most common and reliable threshold for ... Personally I do both. Opk predicts BBT confirms. Of the two I like bbt more. I don’t find it difficult at all, but I’m still ttc#1 so no one wakes me up at night. Just set an alarm for the same time every morning and keep the thermometer and your phone or a pencil beside theCara Guna OPK: boleh start check 2-3 hari selepas period. untuk yang jarang period, disarankan buat BBT (*cara buat BBT ada kat bawah) untuk period yang regular, formula kiraan cycle period – 14 = hari dijangka ovulate. Jadi mula check OPK 2-3 hari sebelum tu. kena check OPK sehingga -ve semula selepas +ve.1. Changes in basal body temperature (BBT) Your BBT is your lowest body temperature (your body temperature at rest) in a 24-hour period. On the day after you ovulate, your BBT will go up slightly, by 0.5 to 1.0 degrees Fahrenheit. It will stay elevated until your next period. It may also dip slightly just before the increase.Feb 28, 2021 · See last answer. Amme N. 28/02/2021 at 5:24 pm. After u ovulate you should have 3 consecutive rises in temp... this is mine this month so I know I’ve ovulated and have been strict with timing temp taking this month.. last month I was a bit wishy washy. Edited on 28/02/2021 at 5:25 pm by Amme N. If your ovulation test is positive, this means that your LH levels are above the threshold considered to be “surging” – meaning that ovulation will likely happen within 24-36 hours. At rest, typical LH levels for women are between 5-25 IU/L, and during the LH surge, they can peak up to 100+ IU/L. The most common and reliable threshold for ...Mar 2, 2018 · In the 3-5 days leading up to ovulation, your cervical mucus will become an egg white consistency, clear and stretchy. This is your fertile mucus and keeping track of it will help you to determine your fertile window. Height of cervix In the days before ovulation, your cervix will change position and shape to help the sperm travel to the ... Yes absolutely. If you took the photo 4 times it would probably spit out 4 different numbers 😂 realistically the numbers don’t mean anything, all you’re looking for is a positive OPK, where the test line is as dark or darker than the control line. Therefore, BBT and OPK combined will let you know if you are really O'ing. If you are still in doubt then you should have your doc test and see if you are or not. I have cysts and was not O'ing at ...BBT shows AFTER O. (You don't get your change on BBT until after you have already O). OPK advised 24-36 hours PRIOR to O. By using OPK and BBT, you should forecast your O date with the OPK and verify you did O via BBT. Whenever you get a few minutes (okay, like 20 or so), I recommend checking out peeonastick.com. This is a very thorough website ...Jul 17, 2022 · OPK or BBT? Curious to hear others experiences when they were TTC. I have been doing both OPK tests and measuring my BBT for several months and I’m noticing that I’ll get a positive OPK but then my body temperature won’t spike for sometimes up to 4 days later. You don't O on the day of a positive opk. It's 12-36 hours after the positive opk, so that's the reason for the low temps for now. Sometimes you can get a positive opk and not O.A bit over 90% of cycles with a positive OPK are ultimately ovulatory (but not necessarily the day after the positive OPK, as the conventional wisdom would tell you). (EDIT: source here) Overall, no, it’s not necessary to track every possible fertility sign, and if you don’t want to track BBT, then you shouldn’t. Mar 12, 2018 at 5:30 AM. For the last year I have always used the dollar tree test. They always work perfect with no fail. In January I tried the clear blue easy digital along with my cheap ones and that was the first month ever that I didn’t ovulate. I had 10 days of flashing smiley faces.Jul 7, 2020 at 9:39 PM. I would count ovulation 12-36 hrs after your Peak result. Thats how I've always done it and I've been successful. I continue to have positive opk for 1 or 2 days after the peak one but i know LH is coming down at that point. And i would BD on ovulation day and the next 2 or 3 days after as well.Hey yeah as a few said you will likely ovulate today. Most often you will see day A. positive opk day B. Ovulation itself day C. Bbt Rise You may see some variance from this, sometimes it takes 2 days to see bbt rise or sometimes your LH surge may happen more than 24hrs before O. But generally the pattern is as listed above.Dec 15, 2017 · Hi All. Husband and I started TTC mid oct 2017. Came off oral contraceptives in 1st week of Oct 2017. Have started using OPK and BBT this cycle (currently on cd16 and last cycle was 29 days, previous cycle was 23 days) but still havent had a positive OPK result (clear blue pink tests) which i check first thing in the morning as the pack tells you to. Mar 12, 2018 at 5:30 AM. For the last year I have always used the dollar tree test. They always work perfect with no fail. In January I tried the clear blue easy digital along with my cheap ones and that was the first month ever that I didn’t ovulate. I had 10 days of flashing smiley faces.Sep 7, 2022 · Ovulation test strips are urine tests that you use at home to detect impending ovulation. They work by detecting the luteinizing hormone (LH), which increases to prompt the release of the egg during ovulation. Sometimes they are called ovulation predictor kits (OPKs), or simply ovulation tests. According to my bbt and my CM, I should be most fertile today, but my daily OPK has been negative. I'm definitely over-thinking this, but it's because I don't think I ovulated at all last month - my chart never showed a sustained rise, my OPK was negative, and we had sex every day for 2 weeks and didn't get pregnant.I have also ready in TCOYF that an OPK can show a positive result before, during, and after you O due to varying levels of LH in urine. HTH. EDIT: So, the answer is yes, you could have a temp rise with a +OPK. ~Sweet Girl *8/18/08* c-section ~ Sweet Boy *12/2/10* VBAC ~ Sweet Boy *8/14/12* VBAC~. Jun 13, 2023 · 1. Changes in basal body temperature (BBT) Your BBT is your lowest body temperature (your body temperature at rest) in a 24-hour period. On the day after you ovulate, your BBT will go up slightly, by 0.5 to 1.0 degrees Fahrenheit. It will stay elevated until your next period. It may also dip slightly just before the increase. Hi everyone, Diagnosed with PCOS in Feb. 2010. Was told to save my money and not bother with BBT, charting, and OPK's cause they wouldn't be accurate since I have PCOS.Cara Guna OPK: boleh start check 2-3 hari selepas period. untuk yang jarang period, disarankan buat BBT (*cara buat BBT ada kat bawah) untuk period yang regular, formula kiraan cycle period – 14 = hari dijangka ovulate. Jadi mula check OPK 2-3 hari sebelum tu. kena check OPK sehingga -ve semula selepas +ve.Nov 13, 2017 · 13/11/2017 at 11:33 pm. Dont worry! It's all normal! The ovulation and the temp rise usually takes place a day or two after your first positive opk! Sometimes I only get one day of positive opks, sometimes two. Usually I get a temp rise the second day after the first opk. But once or twice it was in the third day! It's all ok and normal. Cara Guna OPK: boleh start check 2-3 hari selepas period. untuk yang jarang period, disarankan buat BBT (*cara buat BBT ada kat bawah) untuk period yang regular, formula kiraan cycle period – 14 = hari dijangka ovulate. Jadi mula check OPK 2-3 hari sebelum tu. kena check OPK sehingga -ve semula selepas +ve.

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opk and bbt don

A Discussion on OPK’s vs BBT Charting. Many women become confused when their OPK’s (Ovulation Predictor Kits) and BBT’s (Basal Body Temperatures) don’t agree on the day of ovulation- understandably so. This is one of the more confusing topics I’ve researched! We’ll file this under “advanced topics”. Here’s why.Jun 5, 2012 · Jun 5, 2012 at 7:13 PM. @Destiny_2013, A pos. opk DOES NOT mean u O. It just confirms your lh surge. The only way to confirm O is with temping. U can get a pos. opk and not O. U can also get a neg. opk but temp rise which means u did O. It is possible your body prepared to O but didn't. Ovulation usually occurs about 14 days before your period. Your LH surge occurs a day or two before that. So knowing how long your cycle is (from one period to the next) will help you figure out ...Mar 23, 2015 · Bbt Spike But No Peak Fertility On Opk. K. Karter2013. Mar 23, 2015 at 10:39 AM. I have been TTC since December and still no luck. I started temping this cycle and got a big temp spike this morning. I am using clearblue advanced opk's and I have only gotten two flashing faces which means high fertility, but I haven't gotten a peak fertility yet. Apr 2, 2011 · I am still in shock - I got a bfp today. I was desperately hoping I would get af soon (I have only had one pp period so far) so we could officially start ttc with all the bells and whistles (opk, bbt, supplements, etc). I was actually excited for the cramps I have been feeling - I figured she was right around the corner! I don't know how long I will get to hang around here - but for the moment ... Mar 24, 2021 · Basal body temperature (BBT) tracking: Before and after ovulation, BBT (your body’s lowest resting temperature) dips, then rises again. Tracking this shift can let you know if an egg was released. Tracking this shift can let you know if an egg was released. Oh and by the looks of things, you don't necessarily need a BBT but I've really loved having more accurate charts. :) I got my Life Brand BBT at Shoppers Drug Mart. I change them every 3-4 months so I can rely on my temps being accurate. I don't use a new BBT until the next cycle though.This is my first month using OPK's and I am CD20 or 21 and still no positive. I do tend to have longer cycles usually around 33 days sometimes more and a few times less so I am wondering if that it why. My tests have got a little darker but still nowhere near the control line. I do a test in the afternoon and lately I have been doing one in the ...Jun 13, 2023 · 1. Changes in basal body temperature (BBT) Your BBT is your lowest body temperature (your body temperature at rest) in a 24-hour period. On the day after you ovulate, your BBT will go up slightly, by 0.5 to 1.0 degrees Fahrenheit. It will stay elevated until your next period. It may also dip slightly just before the increase. BBT shows AFTER O. (You don't get your change on BBT until after you have already O). OPK advised 24-36 hours PRIOR to O. By using OPK and BBT, you should forecast your O date with the OPK and verify you did O via BBT. Whenever you get a few minutes (okay, like 20 or so), I recommend checking out peeonastick.com. This is a very thorough website ... Every cycle I have been able to measure the LH surge, and also the temp increase when I have ovulated and drop in BBT when AF is arriving. My FP/Ovulation has been all over the place though, so literally I measure OPK 2 times a day just to make sure I don't miss it. The range has been 18-37 days for ovulation - yup, that's a lot of OPKs! EWCM is not an indicator of ovulation, just that it should be happening soon. 2. It could be seminal or arousal fluids if you have BD in the last 12-24 hours. Most women know this but its worth saying as most couples tracking CM are also BD regularly around the time they think they are going to ovulate. 3. Oct 14, 2017 · When using BBT to try and conceive, Choi says the key is to make sure to have sex starting several days before the anticipated temperature rise. On the other hand, Choi says, OPKs test for the ... When using BBT to try and conceive, Choi says the key is to make sure to have sex starting several days before the anticipated temperature rise. On the other hand, Choi says, OPKs test for the spike in luteinizing hormone (LH) that precedes ovulation by a day or two..

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