The primary objective of the research study is to determine if women taking Cilostazol demonstrate impairment of oocyte maturation in comparison to paired historic controls following ovarian follicle stimulation. For the purposes of our study, oocyte maturation will be assessed using the oocyte maturational stages of prophase I, metaphase I, and metaphase II. Thus, we will be assessing the percent of oocytes aspirated from follicles during controlled ovarian stimulation that progress beyond the germinal vesicle stage (e.g. GVBD) in those women receiving cilostazol and compare this to the maturation of oocytes obtained from the same women who underwent ovarian follicle stimulation previously while not on study drug.