12-10-2011, 04:40 PM
What I read about cycling PM is beginning to make sense now. Estradiol suppresses ovulation. So it's stopping PM on day 12 that triggers an ovulation in one or two days. The period follows 14 days later.
Stopping PM abruptly on day 25 triggers a second ovulation on day 27. That causes the spotting on day 13 of the next cycle. It also explains why some cycles can be as long as 42 days. Symptoms of early pregnancy can also appear in the last week of a long cycle then.
This still does not explain why women who take PM continuously appear to get cycles of 36 days. One day of forgetting PM can be enough, but would they all forget it on day 20? What's so special about day 20?
Stopping PM abruptly on day 25 triggers a second ovulation on day 27. That causes the spotting on day 13 of the next cycle. It also explains why some cycles can be as long as 42 days. Symptoms of early pregnancy can also appear in the last week of a long cycle then.
This still does not explain why women who take PM continuously appear to get cycles of 36 days. One day of forgetting PM can be enough, but would they all forget it on day 20? What's so special about day 20?