What are the main pregnancy hormones? Each of the many hormones discussed below has its own job to fill before, during and after pregnancy, but the following are the main ones in pregnancy that get the baby ball rolling, so to speak, and then prepare your body for labour and delivery. FSH (follicle stimulating hormone) LH (luteinizing hormone) hCG (human chorionic gonadotropin) Estrogen  Progesterone Relaxin Placental growth factor HPL (human placental lactogen) Oxytocin Prolactin Here’s a more in-depth look at each of the main hormones listed above, including the role each plays...