By ectopic pregnancy, we generally refer to tubal pregnancy, where the fertilized egg is implanted in the fallopian tube, rather than in the uterine cavity. It takes 6-8 weeks to repair the uterine wall after ectopic pregnancy surgery due to the effects of blood HCG (human chorionic gonadotropin), and under normal circumstances, menstruation can resume in about 1-2 months. Menstruation is the cyclical shedding and bleeding of the endometrium (once a month, common cycle of about 28 days) that accompanies the cyclical changes of the ovaries; under the regulation of estrogen and progesterone the endometrium is divided into the proliferative phase, the secretory phase, and the menstrual phase (the days we call menstruation, usually 3-5 days, which is the final result of the withdrawal of progesterone and estrogen). The blood HCG promotes the conversion of androgens into estrogens in the body and stimulates the formation of progesterone, which is secreted by the syncytial trophoblast cells of the placental chorionic membrane starting 10-14 days after conception. When ectopic pregnancy is treated surgically, the level of blood HCG in the body drops sharply and it takes about 2-4 weeks to return to the pre-pregnancy level, therefore, in general, the first postoperative period is about 1-2 months after surgery. It is worth noting that for conservative surgery of ectopic pregnancy, such as laparoscopic tubal window retrieval, it is difficult to completely remove the chorionic tissue during the operation, and the residual trophoblast cells may continue to grow and bleed again after the operation, causing abdominal pain and so on, which is called persistent ectopic pregnancy, so that menstruation will not return for a long time after the operation. MTX), if the blood HCG value decreases after the medication and is negative for 3 times in a row, the symptoms will be relieved or disappear. In conclusion, in normal cases, menstruation usually occurs 1-2 months after the ectopic pregnancy surgery. However, in patients with conservative surgery, the possibility of persistent ectopic pregnancy cannot be excluded, and the time of menstrual return after surgery is variable.