Progesterone to promote menstruation 3 days with a lot of brown discharge may be a sign of menstruation, but also to be alert to whether the phenomenon of pregnancy and abortion. 1. Women have delayed menstruation phenomenon, to rule out pregnancy can be taken under the guidance of a doctor progesterone, taking progesterone after progesterone increase, once the drug will be hormone levels drop, will lead to the endometrium shedding bleeding, the formation of menstrual blood discharged. With progesterone to promote menstruation 3 days a lot of brown discharge may be coming to menstruation, the general bleeding will increase the formation of menstrual blood. 2. Pregnancy and abortion. Because of the delayed menstruation of women may be pregnant, such as self-administration of progesterone to promote menstruation after the emergence of a lot of brown discharge, if there has been no normal menstruation, but also need to be vigilant about whether the bleeding symptoms caused by miscarriage of pregnancy, can be combined with the blood HCG and progesterone test. Progesterone to promote menstruation need to be evaluated by a professional obstetrician and gynecologist, can not take the drug at will.