Final answer:
The two hormones crucial for maintaining a pregnancy are estrogens and progesterone. The hormone hCG is also essential in the early stages to preserve the corpus luteum, which produces progesterone until the placenta takes over.
Step-by-step explanation:
The two hormones that are maintained if a pregnancy occurs are estrogens and progesterone. Both hormones are essential for maintaining the pregnancy, with estrogens primarily involved in promoting fetal viability and stimulating tissue growth in both the mother and the developing fetus. Progesterone plays a crucial role in suppressing uterine contractions and preventing the development of new ovarian follicles.
The hormone human chorionic gonadotropin (hCG) is also vital in early pregnancy. It is produced by the outer layer of the blastocyst and acts to preserve the corpus luteum, which in turn continues to secrete progesterone to maintain the pregnancy. As the placenta develops, it takes over the production of these hormones to ensure the progression and health of the pregnancy.