What is the primary purpose of progesterone during pregnancy?

The primary purpose of progesterone during pregnancy is to maintain the uterine lining for implantation. After fertilization, maintaining a suitable environment in the uterus is crucial for the embryo to implant successfully. Progesterone is secreted primarily by the corpus luteum in the early stages of pregnancy, and it plays a vital role in thickening and stabilizing the endometrial lining, ensuring that it is rich and ready to support the developing fetus.

This hormone also helps to suppress uterine contractions, preventing premature labor and allowing the fetus to grow and develop. While it is true that progesterone has various functions, such as influencing the menstrual cycle and aiding in certain metabolic processes, its most significant role in the context of pregnancy is clearly related to creating and maintaining a conducive environment for the embryo.