Inclusion Criteria:  Patients whose physicians plan to prescribe low-dose hCG for ovarian stimulation Age 18-46 Negative serum hCG prior to start of COH BMI >18 and <35 Plan for ejaculated sperm use Plan for PGT testing with euploid embryo transfer  Exclusion Criteria:  Administration of low-dose hCG during frozen embryo transfer cycle Concomitant Menopur administration during ovarian stimulation or during frozen embryo transfer cycle BMI <18 or >35 Age <18 or >46 Presence of hydrosalpinxes that communicate with the endometrial cavity Diagnosis of endometrial insufficiency: prior cycle with maximal endometrial thickness ≤ 6mm, abnormal endometrial pattern (failure to attain a trilaminar appearance), and persistent endometrial fluid Uncorrected uterine factor infertility (uterine anomaly, submucosal myomas, uterine septum) Male partner with <100,000 total motile spermatozoa per ejaculate (donor sperm is acceptable) Use of surgical procedures to obtain sperm Couples undergoing IVF for fertility preservation with no immediate plan for subsequent FET (embryo banking) Personal history of repeated pregnancy loss (two or more unexplained clinical losses defined by presence of fetal heartbeat) Declination of PGT testing