Ultrasound scans (US) will be performed concomitantly with hormonal assessment at each visit. Ovulation will be triggered as soon as there are at least 3 follicles > 16 mm, and with E2 > 1 mcg/L if agonist used. Oocyte retrieval, in vitro fertilization (IVF) or intra-cytoplasmic sperm injection (ICSI) and blastocyst transfer will be performed as per centre's standard practice. Vaginal progesterone will be administered in the luteal phase for all subjects (600 milligram per day [mg/d]).