A scar pregnancy, where the pregnancy is implanted in a scarred area, can cause hemorrhage. If not diagnosed before the miscarriage, the miscarriage can cause hemorrhage, which can be life-threatening in severe cases, so it must be taken seriously. If you have had a previous cesarean section, it is important to rule out a scar pregnancy in this pregnancy. The treatments for scar pregnancy are: 1) embolization plus uterine clearance, embolization of the uterine artery, but embolization may cause premature ovarian failure; 2) local puncture, methotrexate or vascular sclerosing agent to the gestational sac, and then clearance; 3) direct laparoscopy or open abdomen to remove the pregnancy; 4) local puncture, B ultrasound-guided local puncture to remove the gestational sac and then clearance, which may reduce bleeding; 5) when In case of life-threatening hemorrhage, total hysterectomy or subtotal hysterectomy will be performed.