Human chorionic gonadotropin (hCG) is a hormone produced by trophoblast cells that lines a developing embryo that eventually forms the placenta. It is the maternal recognition of pregnancy. Human placental lactogen (hPL) is also known as human chorionic somatomammotropin (HCS). It is a placental hormone that forms the placental lactogen. Its structure and function are parallel to human growth hormone. Estrogen and progesterone are the sex haemones that helps in the regulation of secondary sex harmone. They also help in regulation of the menstrual cycle and play a vital role during pregnancy in women. These two steroid hormones are produced by placenta. Progesterone supports the lining of the womb or uterus that provides the environment for the development of the fetus and placenta.along with these hormones, relaxin, placental growth hormone and kisspeptin are also produced by placenta that provides support during gestation period in pregnancy.