What is the role of progesterone in pregnancy?

Progesterone plays a crucial role in pregnancy, particularly in preparing the uterine lining for the implantation of a fertilized ovum. After ovulation, progesterone levels increase to ensure that the endometrium becomes receptive to the embryo. This hormone helps maintain the thickened uterine lining, providing an appropriate environment for the embryo to attach and grow. Without sufficient progesterone, the uterine lining may shed, resulting in the loss of the embryo and failure of implantation.

In addition to facilitating implantation, progesterone also supports early pregnancy by suppressing uterine contractions, which helps maintain a stable environment for the developing fetus. This action is fundamental in the early stages of pregnancy when the embryo is just beginning to establish itself within the uterine wall. Therefore, the importance of progesterone in implantation is key to supporting the full term of a pregnancy.