Progesterone is taken to establish an artificial cycle, usually 5-7 days after stopping the drug for 5 days in a row, which is the same as a normal period, with a normal range of 2-8 days and an average of about 3-5 days. In the case of menstrual disorders, clinical interventions are often made through progesterone to supplement progesterone in the body and manual measures to adjust sex hormone levels in the body. By taking progesterone, a certain level of progesterone is achieved in the body. The withdrawal bleeding that can be caused after stopping the oral progestogen is the onset of menstruation. Therefore, withdrawal bleeding caused with the help of artificial progesterone is also considered a normal menstrual period. Usually women have a certain cycle of menstruation, with a normal period of 2-8 days, with an average of about 3-5 days. Therefore, withdrawal bleeding after taking progesterone is usually 2-8 days. When menstrual flow occurs after taking progesterone, it is sufficient to manage it according to normal menstruation, while paying attention to regular review and timely adjustment of treatment plan to achieve the expected effect.