In this case report a 38-year-old woman presented with lower abdominal pain three weeks postpartum. She had been delivered by caesarean section after twin pregnancy and was given low-molecular heparin prophylaxis to be taken six weeks post caesarean. The initial clinical examination was normal. A CT scan revealed thrombosis in the right ovarian vein. Therapeutic dosage of low-molecular heparin was initiated, and the patient was further referred for thrombophilia workup. Post-partum ovarian vein thrombosis is a very rare condition but a diagnosis to keep in mind, when women present with lower abdominal pain even weeks after labour.