In a randomized clinical trial of patients referred to Avicenna Infertility Center, we will compare double trigger by GnRh agonist along with HCG versus HCG alone in improving the ART results. After considering the including criteria and receiving appropriate consents, patients are enrolled in the trial. The antagonist cycle begins as Flexible Step Up protocol. When at least two follicles larger than 17 or 18 mm are seen, patients will be divided into two groups based on computerized randomization. The first group receives HCG 10,000 units alone and the other group receives 10,000 units HGC plus 0.2 mg of Decapetyl subcutaneously. All of the oocytes are punctured under sonographic guidance 36 hours after the trigger. After 72 hours, 2 to 3 embryos will be transferred to the uterus and the rest will be frozen. After the puncture, progesterone will be prescribed for luteal phase support. On the third day after trigger and puncture, estradiol, LH, FSH and progesterone levels will be measured and so will the endometrial thickness. BHGC test will be performed and if the pregnancy test is positive, it would be considered a chemical pregnancy. Two weeks after a positive pregnancy test, transvaginal sonography will be performed to check the gestational sac. By detecting FHR in the sonogram clinical pregnancy is confirmed. Then the study will progress till 12th week and a sonography will be done to check the FHR and fetal health and to rule out abortion. These variables will be compared in both groups.