Progesterone can either induce or delay menstruation. The key depends on the purpose of the woman’s use, and the doctor will guide the use of the drug and treatment according to the purpose of use. 1. Promoting menstruation: Progesterone to promote menstruation is mainly used for patients whose menstruation has been delayed for more than 1 week and whose uterine lining is of a certain thickness and pregnancy has been ruled out. Progesterone is a progestin and should be taken on time under doctor’s supervision. After stopping the drug, the endometrial lining will peel off and lead to the onset of menstruation. If you don’t have your period for more than a week after stopping the medication, it is recommended to go to the hospital for further examination. 2. Delay menstruation: If you usually have regular menstruation, you can start taking progesterone orally under the guidance of your doctor 1~2 weeks before your monthly vacation, and stop taking it when you want to have a vacation, and you will have your vacation about 1 week after stopping the medication. Progesterone is mainly used for the treatment of irregular menstruation, luteal insufficiency, preeclampsia and habitual abortion. Patients can use progesterone according to different needs under the guidance of the doctor, do not self-medication.