How long does progesterone take to menstruate?

Female menstrual cramps, due to periodic changes in ovarian hormones, endometrial periodic exfoliation, bleeding caused. In the first half of the menstrual cycle, the endometrium by ovarian estrogen influence, was a proliferative phase change, ovulation, luteal formation, luteal secretion of progesterone, endometrial pregnancy hormone influence, was a secretory phase change. The life of corpus luteum is generally 14 days, 14 days later, corpus luteum atrophy, the body's progesterone levels drop sharply, the endometrium loses the support of progesterone, stripping bleeding, so menstrual cramps. Therefore, taking progesterone to menstruation, is to simulate the body's hormone levels, so that the body's progesterone levels drop sharply, causing menstrual cramps. Generally take medicine for 5 days, 3 to 7 days after stopping the drug, menstruation will occur, if not menstruation after stopping the drug, it is caused by low estrogen level in the body, to further find out the reason.