Pregnancy on scar is a rare clinical entity whose main complication remains hemorrhage which can be cataclysmic engaging the maternal vital prognosis. The diagnosis is essentially based on a thorough clinical and ultrasound examination. We report here the case of a 38-year-old patient with a tri-scar uterus, with a pregnancy of 08 SA, whose diagnosis of pregnancy on scar was not raised, and who was admitted into our structure for the management of a simple aborted pregnancy. An aspiration was proposed to the patient after a retention period of 04 weeks, during the act: the patient presented a massive hemorrhage, and a hysterectomy of hemostasis was performed because of the maternal vital prognosis that was at stake.