The most normal days of menstrual cycle

　　How many days in a menstrual cycle are the most normal? The most normal menstrual cycle progression is as follows:

　　Starting on the first day of menstruation, the hypothalamus has produced "follicle-stimulating hormone": a new egg has begun to mature in one of the follicles.

　　After day 4, after the follicles produce estrogen, estrogen stimulates Uterus Wall growth and breast development inhibit the production of "follicle-stimulating hormone" and stimulate the hypothalamus to release progesterone.

　　After the 12th day, progesterone causes the follicle to rupture, release the egg, and turns the damaged follicle into a "corpus luteum" to produce progesterone and estrogen.

　　After the 14th day, progesterone thickens the uterine wall to prepare the fertilized egg for implantation and inhibits the production of progesterone. Without the support of progesterone, the corpus luteum degenerates, estrogen and progesterone levels decrease, and finally the endometrium sheds and menstruation begins (day 28). Estrogen no longer suppresses the "follicle-stimulating hormone" and the cycle begins again. 》》》 Find out a woman’s sexual interest from the shape of her breasts