When you become pregnant, your body produces a pregnancy hormone called human chorionic gonadotropin (hCG). It is produced by the placenta and is responsible for the rise in your progesterone level and the cause of many changes during pregnancy, including morning sickness. In fact, hCG is the hormone that home pregnancy tests detect to determine whether you are pregnant.
In assisted reproductive technology procedures, an injection of hCG is often used as a way to trigger ovulation.
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