What are the two main hormones involved in pregnancy?

The two main hormones involved in pregnancy are oestrogen and progesterone.

Oestrogen plays a critical role in many physiological processes during pregnancy, including the regulation of other hormones and the preparation of the uterus to support the developing fetus. It promotes the growth of the uterine lining and stimulates mammary gland development for breastfeeding. Additionally, oestrogen contributes to various changes in maternal physiology, ensuring that the body can adapt to the demands of carrying a fetus.

Progesterone is equally vital for maintaining pregnancy. It helps to stabilize the uterine lining, preventing contractions that could lead to premature labor. Progesterone also supports the implantation of the fertilized egg and helps suppress the maternal immune response to allow the fetus, which is genetically different from the mother, to develop without being rejected.

Together, these hormones create an optimal environment for both the growth and development of the fetus and the health of the mother throughout the course of pregnancy.