If oral progesterone to promote menstruation, usually need to take 3-5 days of continuous time before stopping the drug, after stopping the drug is not immediately menstruation, but need to stop the drug 3-7 days before menstruation will come. If it is the eighth day after stopping the pill and you have not yet had your period, it is often due to the following reasons.1. Pregnancy. Even with the use of progesterone, menstruation will not occur, it is recommended that you can collect morning urine to do early pregnancy test. 2, ovarian function decline. Once the ovarian function declines, it is clinically irreversible, and even after taking progesterone orally, menstruation will not occur after stopping the medication.3. Damage to the endometrium resulting in complete adhesion of the uterine cavity. Even after stopping progesterone, you won’t get your period.