#During the first 12 weeks of pregnancy (the first trimester), significant hormonal changes occur to support the developing embryo and prepare the body for pregnancy. Here are the key hormones involved and their roles:
1. Human Chorionic Gonadotropin (hCG)
Produced by the placenta after implantation
Maintains the corpus luteum, which secretes progesterone until the placenta takes over around week 10-12
Responsible for early pregnancy symptoms like nausea and fatigue
2. Progesterone
Initially secreted by the corpus luteum, then by the placenta from the end of the first trimester
Prevents uterine contractions and supports the uterine lining
Helps suppress the immune system to prevent rejection of the embryo
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