If the uterus recovers well twice, there is no residue in the uterine cavity and menstruation is regular, it is impossible to check. Miscarriage is divided into abortion and medication abortion, medication abortion is through oral medication to avoid uterine operation, side effects also exist objectively, such as long vaginal bleeding after abortion and the possibility of vaginal haemorrhage. Regardless of the type of abortion will cause damage to the body, especially to the endometrium, abortion is prone to complications such as tubal obstruction, endometritis, pelvic infections, uterine adhesions manifested as periodic abdominal pain and amenorrhea, incomplete aspiration manifested as prolonged vaginal bleeding, large amount of blood or after the bleeding stops, there is more bleeding, and if necessary, scraping is required. Repeated miscarriages have a great impact on menstruation and can lead to infertility in the future. It is best to use contraception during intercourse to reduce the damage caused by unwanted pregnancy.