In the past few years, much interest has been focused on the possible effect of estradiol in reversing the antiestrogenic effect of CC on the endometrium, thus increasing the pregnancy rate. Another approach is the use of vaginal progesterone aiming as a luteal phase support.Patients enrolled in this study were allocated to three groups; control group (group I) receiving CC induction alone, 2nd group (group II) receiving CC with ethinyl estradiol, 3rd group (group III) receiving CC with vaginal Progesterone, respectively.,The use of ethinyl estradiol or vaginal Progesterone with ovulation induction by CC would improve the endometrial parameters which are believed to be one of the most important predictive factors of successful implantation and hence better pregnancy rates.