When early menstruation occurs after taking emergency contraceptive pill, you should first determine whether the bleeding is menstruation. If it is not menstruation, it may belong to drug-induced withdrawal bleeding, which is normal; if it is menstruation, it is usually caused by drug-induced endocrine disorder, which needs to be dealt with according to different situations. I. Vaginal bleeding after the pill: 1. Retreat bleeding: taking the emergency contraceptive pill will lead to certain changes in the endometrium and a large number of shedding leading to bleeding, i.e. retreat bleeding, not menstruation; 2. Fertilized egg implantation: contraceptive failure leads to sperm-egg union and a small amount of bleeding will occur when the fertilized egg implants, which generally does not require special treatment. Second, after the pill menstrual flow: emergency contraceptive pill components belong to a higher concentration of progestin, after taking it is prone to abnormal fluctuations of hormones in the female body, breaking the normal ovulation cycle, causing menstrual disorders, the symptoms of early menstruation, the bleeding time and the amount of bleeding in this case is generally similar to previous menstruation. If the bleeding is heavy, it may lead to acute anemia. Progestin or other hormonal drugs should be used to stop the bleeding in time, and if necessary, estrogen and progestin combination can also be used to adjust the menstrual cycle. The emergency contraceptive pill has significant side effects on women’s health and should not be used as a regular form of contraception, and it is not recommended to use it more than three times a year. If ovulation and menstruation have resumed, continue to use contraceptive measures if you are not planning to get pregnant.