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Conception Calendar Basics


It is amazing that, despite the fact that women menstruate pretty much every 28-35 days, we often know little about our fertile days. This is how many unintended pregnancies occur! And for those struggling with conceiving, this may also be why that is not working.

Your cycle has two phases: the follicular phase, which starts with menstruation, and the luteal phase, which is the time after ovulation. Day 1 of your cycle is the first day of full flow menstruation, not the last day. Some doctors say to count it only if it starts by noon, others say by midnight is fine. Most women menstruate for 4-7 days, longer may indicate fibroids or endometriosis. Shorter might indicate a thin endometrium, but most doctors don’t place too much emphasis on this. What they are concerned with is regularity—-do you get a period every 28-35 days? If shorter, that could be a luteal phase defect, and if longer, then you might not be ovulating monthly.

During your period, the follicles that contain eggs begin to grow in preparation for the next ovulation. More than one follicle will grow every month, and follicles will grow on both ovaries each month—-was anybody else taught that only one ovary develops a follicle each month? However, typically, one follicle becomes dominant and grows bigger and releases an egg while the other follicles shrink. This phase lasts until about day 14 for a woman with a 28 day cycle. This phase may be longer if your cycle is longer.

Then you ovulate! The ovary releases the egg, and the fallopian tube sweeps it up. This is where the sperm meets up with the egg and fertilizes it. Ovulation can be detected by ovulation testing kits, which measure LH (luteinizing hormone) in the urine. LH begins to rise to trigger ovulation, and it peaks quickly and drops off again, all within 24 hours. A good question that women ask is how do you know if you caught the LH on the way up or the way down? With these kits, you don’t know, but it doesn't matter. The egg gets released usually within 24-48 hours after you detect the beginning of the surge, so if you’re catching the fall of it, you’re still within the window of fertility. However, since an egg only lives about 24 hours unfertilized, intercourse 4 days after ovulation will not result in conception.

Then comes the luteal phase where the follicle that released an egg becomes a corpus luteum, which simply means “yellow body.” The corpus luteum produces progesterone, which prepares the endometrium for possible implantation. This phase is pretty much 14 days long for all women, regardless of when you ovulate. If you have a long cycle, the additional days are in the follicular phase before ovulation, not the luteal phase.

Since sperm live 3-7 days in the fallopian tubes, intercourse on the actual day of ovulation is not so important if you're trying to conceive. What is important is timing intercourse starting just a few days before and during ovulation, but not after! And if you’re trying to prevent conception, you will have to use protection or abstain well in advance of your anticipated ovulation, which is tricky if you only use a calendar. If that’s your intention, you need to look into other methods to help you!
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Content copyright © 2014 by Stacy Wiegman. All rights reserved.
This content was written by Stacy Wiegman. If you wish to use this content in any manner, you need written permission. Contact Stacy Wiegman for details.

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