Uterine rupture during first trimester of pregnancy is an extremely rare, but life threatening cause of intraperitoneal haemorrhage. Review of literature revealed that all reports of first trimester uterine rupture are related to scar dehiscence following previous caesarean section or occurred in unscarred uteri of multiparous woman. In early pregnancy of approximately 4-5 weeks, vaginal ultrasonography may clearly verify a scar pregnancy, but sonographical diagnostic findings may change with the pregnancy progress. If scar pregnancy diagnosed early complications can be avoidable otherwise woman will be at risk of uterine scar rupture, haemorrhage or even secondary abdominal pregnancy and maternal morbidity and mortality. We present a case of uterine rupture which occurred at nine weeks of gestation and the cause was the previous uterine surgery due to adherent placental polyp at fundus. We postulate our hypothesis, that all first trimester uterine ruptures are caused by scar implantation of the trophoblast.