 Group 2-Titrated Letrozole Group: Provided their blood tests and sonograms were within normal limits, patients who are randomized to the titrated dose of Letrozole, will start gonadotropins in the evening of day 2 of their menstrual cycle with injectable follicle stimulating hormone FSH and human menopausal gonadotropin HMG. Oral Letrozole will be added to the stimulation in the following titrated regimen: 