 Starting from cycle day 9, ultrasound scans were repeated daily to monitor follicle growth number and mean diameter. Ultrasound examination was done by the same doctor to avoid interobserver variability and he was blinded to the treatment groups. When the optimal follicle size was reached i.e. mean follicular diameter 18 mm, HCG 10,000 IU Epifasi, EPICO, Egypt was given intramuscular to trigger ovulation. No HCG was given and protected sexual intercourse was advised, if there were 3 follicles with a diameter 16mm to avoid the risk of ovarian hyperstimulation syndrome and multiple gestations. Intrauterine insemination was performed 36 - 40 hours after HCG injection using soft tip catheter. 