Your Odds of Getting Pregnant If You Have Sex After Ovulation
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Your chance of getting pregnant after ovulation is small. One day past ovulation, your odds are between zero and 11 percent.
But don’t let that stop you from having sex!
You may be mistaken about your exact day of ovulation. Plus, sex after fertilization may boost your odds of pregnancy.
Your Odds of Conceiving Before and After Ovulation
Ideally, if you want to get pregnant, you need to have sex before you ovulate.
If you were confused about this before—and thought sex needs to come after ovulation—you’re not alone. Many women don’t realize that the best time to have sex to get pregnant is before and not after ovulation.
However, let’s say you think you’ve already ovulated… is there any point in having sex, just in case? Yes.
There have been several research studies on the odds of conception at various stages of the menstrual cycle. Everyone agrees that your best odds of conception are the day before and the day of ovulation. But not everyone agrees on how likely you are to conceive once ovulation has passed.
Based on a number of studies, your odds of getting pregnant from having intercourse once may be anywhere in these ranges:
- 21 to 35 percent one day before ovulation
- 10 to 33 percent on ovulation day
- 0 to 11 percent one day past ovulation
- 0 to 9 percent two days past ovulation
This is assuming you have sex just once during your fertile window. If you have sex before you ovulate and the day after, your odds will be significantly different (better!) than if you have sex only after you ovulated.
Ovulation Day Errors: You May Be Wrong About When You Ovulated
Most methods of ovulation prediction aren’t extremely accurate. There is a margin of error.
So, even though you think you already ovulated, you may be wrong.
There are many ways to detect your most fertile time. Here are some of the most popular ones:
- Body basal temperature charting
- Tracking cervical mucus changes (the best one to use, per the research!)
- Using an ovulation predictor test
Body basal temperature charting is often considered to be the most accurate, but it’s not error-free. According to one study, body basal temperature charting predicted the day of ovulation correctly only 43 percent of the time. That’s less than half the time.
If you were trying to pinpoint ovulation day by measuring urinary levels of the hormone LH (like you do with an ovulation predictor test), you’d only determine the exact day 60 percent of the time.
Even if you think you’ve already ovulated, go ahead and have sex. The worst that’ll happen is you’ll have sex that you didn’t have to have. It’s a “risk” worth taking!
Embryo Implantation: A Different Reason to Have Sex After Ovulation
There’s another reason to have sex even if you’ve already ovulated: it may improve your odds of embryo implantation.
Having a fertilized egg doesn’t guarantee you a pregnancy. Nowhere is this more apparent than with IVF treatment. During IVF, eggs and sperm are put together in the lab. If all goes well, a few healthy embryos will result. However, transferring these embryos into the uterus doesn’t guarantee a viable pregnancy.
A small but interesting study looked at the effect sexual intercourse has on pregnancy success and IVF. In this study, one group of couples had sexual intercourse around the time of embryo transfer. The other group abstained from sex. The initial pregnancy rates between the groups were not that different. However, the number of women who were still pregnant at 6 to 8 weeks was significant. Of the group that had sex around the time of embryo transfer, 11.01 percent were still pregnant at 6 to 8 weeks. As for the couples who did not have sex around embryo transfer, only 7.69 percent were still pregnant at 6 to 8 weeks.
Why? The theory is that semen may play a role in embryo health and development.
How Long After Ovulation Do You Conceive?
This depends on how you define “conceive.” Fertilization of the ovulated egg must take place within 12 to 24 hours. After that, the egg is no longer viable.
But fertilization of the egg doesn’t mean you’re pregnant. As mentioned above, anyone who has gone through IVF can tell you, having an embryo (which is a fertilized egg) doesn’t guarantee a pregnancy. You’re not pregnant until the embryo implants itself into the uterine lining.
Embryo implantation takes place between 5 and 10 days after ovulation. It usually takes another several days before you will get a positive result on a pregnancy test.
A Word From Tips For Healthy Living
When you’re trying to get pregnant, it can be tempting to worry about whether you’re having sex “at the right time.” While there are particular days when you’re more likely to conceive, sex shouldn’t only be about baby-making.
That said, if your only chance to have sex happens to fall after ovulation, it’s natural to wonder if it “counts.”
Here’s the bottom line: whether you think you’ve already ovulated or not, have sex. You may have miscalculated and think you ovulated already when you haven’t… or, even if you already ovulated, it’s possible sex after ovulation could help along an embryo.
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