Progesterone can both induce and delay menstruation. The key depends on the purpose of the woman’s use, and the doctor will guide the use and treatment of the drug according to the purpose of use. If a woman needs to postpone the onset of her menstruation, she should start taking progesterone capsules twice a day, two at a time, a week before her menstrual period, until she stops taking the medication on the day she plans to have her menstrual period, which usually occurs about three days after she stops taking the medication. If a woman is trying to induce menstruation, she can stop taking progesterone after five days and the onset of menstruation indicates that it is normal. If the menstruation still does not come, go to the hospital for further examination to exclude pregnancy on the one hand and female endocrine disorders on the other.