Overview Prolonged Progesterone to Prevent Preterm Birth From IVF - ET Status: Not yet recruiting Trial end date: 2025-02-28 Target enrollment: Participant gender: Summary To investigate the incidence of preterm birth in IVF fresh embryo transplantation cycle patients after prolonged vaginal progesterone treatment Phase: Phase 4 Details Lead Sponsor: Sun Yat-Sen Memorial Hospital of Sun Yat-Sen UniversityTreatments: Progesterone