If it is the case that menstruation does not return after stopping birth control pills, in this case the possibility of pregnancy should be ruled out first. Although the pill has been taken to prevent pregnancy, the effect of the pill does not necessarily reach 100 percent to play the role of contraception. In addition, if you don’t have a period after stopping the pill, it is considered that the pill itself has caused the endometrium to atrophy, so that it will take some time for the endometrium to recover. In addition, the contraceptive pill itself will inhibit ovulation of the ovary, and it will take some time for someone to regain normal ovarian function when the ovary recovers. Therefore, clinical observation is given first. During the observation period, it is better to strengthen nutrition and drink more soy milk. So, supplementation of exogenous estrogen thickens the endometrium.