200 selected patients with previous unexplained recurrent pregnancy loss are divided into 2 groups:Group A (n = 100) are put on Inj. UFH (Cal-heparin) 5000 U subcutaneous twice daily plus Aspirin 81 mg/day (Juspirin) with the ﬁrst positive pregnancy test, Inj. UFH is given either into anterior abdominal wall or anterior aspect of thigh subcutaneously. While group B (n = 100) receive no thing