Once I Detect My LH Surge, When Should I Have Intercourse?

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To understand when the best time to have intercourse when you are trying to conceive, it is important to understand exactly how a woman’s ovulatory cycle works, and to understand how exactly that relates to conception. Conception occurs when a sperm meets and fertilized an egg in the woman’s fallopian tube. During a woman’s monthly cycle, one of her ovaries will release an egg into the fallopian tube. This is called ovulation. This egg can only survive for around one day in your fallopian tube. Therefore, a sperm would have to meet it pretty much right away when you ovulate.

This means, then, that the sperm need to be in your body and in proximity to the fallopian tubes right as you are ovulating. Conception is most likely to occur if you have intercourse on the day that you ovulate. Having said that, conception can occur up to six days after intercourse. This is because the sperm can survive for up to this amount of time in a woman’s body. Still, for the optimum chances at success in conceiving, you should have intercourse on the day that you ovulate, as well as the two or three days prior. This maximized the possibility that you will successfully conceive.

This is where the LH surge comes into play. An ovulation test or ovulation predictor kit is designed to measure the level of luteinizing hormone (LH) in your system. This is due to the fact that around 12 to 48 hours prior to the time that you ovulate, you will experience a surge in luteinizing hormone. The ovulation test or ovulation prediction kit will measure this LH surge, and lets you know that ovulation is going to occur in the next one to two days. You should have intercourse for the subsequent three days after you detect your LH surge if you are trying to conceive.

If you have been trying to conceive for a few months and have a relatively reliable cycle, you might be able to have intercourse even the day before you detect your LH surge, although if your cycle tends to be somewhat irregular this won’t work for you as you can’t be certain when exactly it is that you are going to be able to detect your LH surge.

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This entry was posted in Getting Pregnant.


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