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Your menstrual cycle is based on a delicate balance of 2 hormones, estrogen and progesterone. The levels of these hormones change as your cycle progresses.
A typical cycle is 28 days. Of course, every woman's cycle is different. Some women's cycles are as short as 23 days; others are as long as 35 days.
Regardless of the timing, the basic sequence of events is the same:
The first day of your period is considered Day 1 of your cycle. At this time, estrogen and progesterone, the 2 main reproductive hormones, are at low levels.
Inside the ovary, each egg is surrounded by a layer of cells called a follicle. As an individual egg develops, the follicle releases increasing amounts of estrogen.
Toward the end of this stage, estrogen levels drop slightly while levels of hormones known as androgens rise. Levels of progesterone and androgens, such as testosterone, start out flat and then increase.
Men and women both have hormones known as androgens in their bodies. The main androgen is called testosterone.
Androgen helps maintain muscle, bone mass, and a healthy sex drive. It also helps regulate a woman's menstrual cycle. Since women need a much smaller amount of testosterone, they tend to have very low levels of androgens.
The follicle surrounding the egg breaks open and the ovaries releases the egg into the fallopian tube so it can be fertilized by sperm. The follicle stays behind in the ovary.
If the egg that was released is not fertilized, estrogen and progesterone levels drop and the lining of the uterus gets ready to be shed. Your next period begins and the cycle starts again.
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