Ovarian Vein Thrombosis (OVT) is a rare, yet a serious complication, especially if it extends to an inferior cava vein. OVT can occur at any stage, but it mostly occurs during the postpartum period. Diagnosis is not often immediately apparent, and many other diseases can mimic this condition. Exclusion of any infectious etiologic cause in a postpartum patient with fever is the first step in establishing an OVT diagnosis. It can be accurately diagnosed by appropriate non-invasive investigations to enable early therapy with anticoagulants and intravenous antibiotics, which are the mainstay of treatment. We present a case of a 38-year-old female in the postpartum period who was diagnosed with right OVT reaching the inferior vein cava after a vaginal delivery. She was treated with intravenous antibiotic and anticoagulant therapy and had a successful recovery after repeated image six months after, showing complete resolution of thrombus.