What is the role of progesterone during pregnancy?

The primary role of progesterone during pregnancy is to maintain the uterine lining and support the pregnancy. After fertilization, progesterone is crucial for preparing the endometrium (the lining of the uterus) for implantation of the fertilized egg. It helps to thicken the endometrial lining and maintain it throughout the early stages of pregnancy, preventing it from shedding, which would otherwise lead to miscarriage.

Additionally, progesterone is involved in inhibiting uterine contractions, ensuring that the uterus remains calm to support the growing fetus. This helps to create a stable environment for the embryo and fetus, allowing for the development of the placenta and fetal structures. Furthermore, progesterone helps to modulate the immune response, ensuring that the mother’s body does not reject the fetus.

In contrast, triggers for labor, stimulation of contractions, and the production of breast milk are functions related to other hormones, such as oxytocin for labor and prolactin for milk production. Understanding the specific role of progesterone emphasizes its importance in the maintenance and success of a pregnancy.