A unicornuate uterus with non communicating rudimentary horn is a rare mullerian abnormality. This uterine anomaly may cause many gynecological and obstetric complications, including infertility, recurrent abortions, preterm deliveries and rupture of the unscarred uterus, especially when the pregnancy implants in the rudimentary horn. Pregnancy in noncommunicating rudimentary horn is one of the rare sites of ectopic pregnancy and is life threatening. Rupture of this kind of ectopic pregnancy is late, usually in second trimester. One such case who presented as massive haemoperitoneum is being presented. Second gravida, was admitted at 22 weks of gestation with pain abdomen and vomiting.