We herein describe a 34-year old infertile woman with polycystic ovary syndrome who was underwent follicle stimulation with a gonadotrophin-releasing hormone (GnRH) agonist, and a freeze-all approach, but still conceived spontaneously without any luteal phase support and without development of ovarian hyperstimulation syndrome. The bilateral antral follicle count of the patient was 22. A fixed GnRH antagonist protocol was used. As the number of follicles wider than 11 mm in diameter on the day of stimulation was 28, the final oocyte maturation was triggered by a GnRH agonist and a freeze-all approach was taken. Although no luteal phase support was used after trigger, the patient conceived spontaneously. In conclusion, the endogenous LH level during the luteal phase may be sufficiently high in selected cases to rescue some of the corpora lutea even when a GnRH agonist has been administered for final oocyte maturation. When a freeze-all approach is taken to avoid ovarian hyperstimulation syndrome, couples should be strictly advised to refrain from sexual intercourse after oocyte retrieval. (C) 2015 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.