How soon after implantation do hCG levels rise?

Answer:
HCG stands for "Human Chorionic Gonadotropin", the pregnancy hormone. HCG is being produced by the placenta and enters the blood stream as soon as implantation happens, about one week after fertilization and ovulation, when the embryo implants and the placenta attaches to the uterine lining.
First answer by AftershockXP. Last edit by AftershockXP. Contributor trust: 4 [recommend contributor recommended]. Question popularity: 3 [recommend question].