Background: Incidence of ovarian ectopic pregnancy is about 0.001% to 0.013% of normal pregnancies. Pregnancy with Copper T device in-situ comes with increased chances of ectopic pregnancy. Case Report: A 23-year lady with intrauterine copper-T device (Cu T 380A) in-situ, presented with complaint of pain in lower abdomen. There was no history of overdue of menstruation. Her urine pregnancy was positive, per vaginum examination showed tenderness and fullness in right fornix, ßHCG=4300, ultrasound showed free fluid in pouch of Douglas.  Laparotomy showed hemoperitoneum and ruptured right ovarian ectopic pregnancy. Wedge resection and reconstruction of ovary was done. Histopathological examination confirmed ovarian ectopic pregnancy. Conclusion: Recognizing ovarian ectopic pregnancy is of critical importance, and should be considered in the differential diagnosis of acute abdomen in women of reproductive age.