How long did progesterone last?

If the endometrium grows thick enough, menstruation occurs about two weeks after taking progesterone. For some patients with menstrual disorders, doctors prescribe progesterone, which has a menstrual regulating effect. Menstruation disorder patients should prevent private medication, there are several cases may cause taking progesterone will not come menstruation, the first case is pregnant, the second case is very thin endometrium, may be endometrial damage, has entered the menopause endometrium is thin, so eat progesterone can not come menstruation.