Vaginal Progesterone Versus Progesterone in Oil in Donor Egg Recipient In Vitro Fertilization Cycles Utilizing Vitrified Donor Eggs

Inclusion Criteria: Oocyte Donors: * Age 21-34 years of age * BMI 18-34 * Normal ovarian reserve, defined as FSH \<10 and AFC \>10 * Medical evaluation consistent with FDA criteria for donor inclusion Donor Oocyte Recipients * Documented history of infertility requiring donor oocyte for optimal fertility potential * Documentation of a normal uterine cavity by hysteroscopy, hysterosonogram, or HSG within 1 year of study screening * Fresh or Frozen Sperm Exclusion Criteria: Oocyte Donors: * Abnormal ovarian reserve, defined as FSH \<10, AFC\>10, prior poor response to controlled ovarian hyper-stimulation(COHS) * Failure to meet FDA criteria for donor approval (risk factor and medical evaluation) * Previous history of poor response to COHS Donor Oocyte Recipients: * Uncontrolled hypothyroidism, hyperprolactinemia, or systemic disease that may interfere with study treatment * Active thrombophlebitis or thromboembolic disorders, or a history of hormone associated thrombophlebitis or thromboembolic disorders * Surgically aspirated sperm (TESE) * 2 or more clinical pregnancy losses (excluding aneuploidy for previous autologous cycles) * Clinically significant gynecologic pathology or uterine abnormality, such as submucosal fibroids \> 5 cm, communicating hydrosalpinx, uncorrected uterine septum, undiagnosed vaginal bleeding, endometrial atypia, or any other condition that could adversely affect pregnancy outcomes * History of 2 or more failed IVF donor cycles