GNRH1 and spontaneous abortion: Findings suggest that the combination of 0.1 mg subcutaneous GnRH agonist in a single (Day 3 post embryo transfer) or double (Day 3 and Day 6 post embryo transfer) schema with vaginal progesterone continuing for up to 12 weeks appears to significantly improve clinical pregnancy events in frozen embryo transfer cycles whilst associating with a reduction in miscarriage events.