Take progesterone menstrual flow may be due to the time when you should not take the medicine, progesterone belongs to progesterone, generally the menstrual flow is more, oral progesterone can play a role in stopping the bleeding. If the menstrual cycle is regular and normal, do not eat progesterone during the menstrual period, if the menstrual cycle is not too regular, the period is too long more than 7 days, the bleeding is more, do ultrasound endothelial thickening caused by the menstrual bleeding, this situation can be oral progesterone to stop the bleeding. In this case, progesterone is used to gradually reduce the amount of menstruation until the bleeding stops, but after the bleeding stops progesterone will have withdrawal bleeding once it is stopped, which is equivalent to having a menstrual period, so that the thickened lining is completely shed.