In most cases, menstruation occurs at the latest 7 days after taking progesterone. Progesterone is a progestin that is usually taken orally for 5-10 days to have a promenstrual effect, with menstruation occurring around 3-7 days after stopping the medication. If you have not had your period for more than 7 days, women who have had sex should first check the early pregnancy test to rule out the possibility of pregnancy; women who are not pregnant should consider not only progesterone deficiency, but also estrogen deficiency or amenorrhea caused by other conditions, it is recommended to go to the hospital gynecology department to improve the examination, clarify the cause, and adjust the medication under the guidance of the doctor. Menstruation is affected by many factors, such as poor rest, poor nutrition, illness or cold, etc., which may lead to abnormal menstruation. While taking progesterone to regulate menstruation, you should also pay attention to the regulation of life, avoid staying up late, keep your mood relaxed, reasonably increase nutrition, do not blindly lose weight, etc., which will help the recovery of menstruation.