Participants will:
* Take either drospirenone (a daily pill) or the standard daily injection during their ovarian stimulation cycle, alongside their regular fertility hormone injections
* Undergo egg retrieval, with all resulting embryos frozen (no fresh embryo transfer in this study)
* Have a frozen embryo transferred in a later cycle
* Complete two short questionnaires about their treatment experience - once before starting the injections/pills, and once after the stimulation phase ends
* Be followed to determine if the embryo transfer results in a pregnancy