 Group1-Fixed Letrozole Group: Provided their blood tests and sonograms were within normal limits, patients who are randomized to fixed dose Letrozole will start Letrozole 5mg daily orally on the second day of their menstrual cycle and then gonadotropins on the fourth day of their menstrual cycle Current Letrozole protocol at CRMI. Patients will be monitored with daily blood tests for estradiol and LH and sonogram every 1-3 days. Adjustments to gonadotropin dosing will be made as per usual protocol for IVF. Letrozole dose will not change and will continue for two weeks after egg retrieval. 