GnRH Agonist for Dual Trigger in IVF and for Luteal Phase Support in FET

IVF Inclusion criteria: \- Women aged \<43 years at the time of IVF treatment Exclusion criteria: * Preimplantation genetic diagnosis treatment * Use of donor oocytes or donor embryos * Hydrosalpinx shown on pelvic scanning and not surgically treated * Women at risk of OHSS FET Inclusion criteria: * Women aged \<43 years at the time of IVF treatment * Replacing early cleavage embryos or blastocysts after thawing * FET in natural cycles Exclusion criteria: * Frozen early cleavage embryos thawed and cultured to blastocysts prior to transfer as requested by the patient * Preimplantation genetic diagnosis treatment * Use of donor oocytes or donor embryos * Hydrosalpinx shown on pelvic scanning and not surgically treated