According to the text, the placenta produces hormones like human chorionic gonadotropin (hCG) and human placental lactogen (hPL). Additionally, in the later phase of pregnancy, a hormone called relaxin is secreted by the ovary. The text explicitly states: 'Let us remember that hCG, hPL and relaxin are produced in women only during pregnancy'. Other hormones like estrogen and progesterone are produced during the normal menstrual cycle as well, though their levels increase during pregnancy .