when is hcg produced
Fun hCG facts to learn and share. Human chorionic gonadotropin (hCG) is a hormone produced during pregnancy by the placenta. It starts to be produced shortly after an embryo implants, and is expected to double approximately every 48 to 72 hours in early pregnancy.The absolute level of hCG in a pregnant woman's blood is less critical than the rate of rise.t starts to be produced shortly after an embryo implants, and is expected to double approximately every 48 to 72 hours in early pregnancy. The absolute level of hCG in a pregnant woman's blood is less critical than the rate of rise.