Ovarian pregnancy accounts for up to 3% of all ectopic pregnancy but is the most common form of non-tubal ectopic pregnancy. Its diagnosis often is difficult to distinguish as it is frequently confused with a ruptured corpus luteum cyst and clinically with a tubal ectopic. Hereby, presenting a case of primary ovarian pregnancy in a 29-year-old patient, referred from District Hospital Thoubal as query ectopic to Regional Institute of Medical Sciences (RIMS) Imphal. She presented with the complaint of severe lower abdominal pain with history of loss of consciousness, severe pallor and per vaginal findings suggestive of ruptured ectopic.The decision for emergency laparotomy was taken and intraoperatively it was found that patient showing intact tube with ruptured ovarian pregnancy, hence proceeded with right oophorectomy. Aetiological, clinical and therapeutic aspects of this rare extrauterine pregnancy are described. Also, the problems of its differential diagnosis are discussed.