You do not need to take progesterone for menstruation. Progesterone also means progestin, and you can stop taking progesterone immediately if you have your period, when the endometrium has been secreted and there is no need for progestin supplementation. Progesterone has the function of regulating menstruation. When women have irregular menstrual cycle and thick endometrium, progesterone can be given to increase the level of progesterone in the body. Menstruation will come after 3-5 days of discontinuation. If progesterone is still needed in the next cycle, it should be taken on the 16th day of the menstrual cycle, and progesterone is used to regulate the menstrual cycle, which needs to be taken for a period of 3 consecutive months.