The second month after taking the pill, menstruation is likely to be delayed, because the pill itself will inhibit ovarian ovulation, which breaks the original natural ovulation of the ovaries, which will lead to endocrine disorders, especially the more sensitive patients will be irregular menstruation phenomenon, which tends to make menstruation delayed. It is recommended that once menstruation is delayed, with normal sexual life, first rule out the possibility of pregnancy, if there is no pregnancy, the consideration of endocrine disorders, it is recommended that oral progesterone to promote menstruation, once a day, once 2 pills, take 3 days, 3-7 days after stopping the drug will come to menstruation. If the eighth day has not come to menstruation, we must pay attention to, need to rule out the possibility of premature ovarian failure.