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What are HCG Levels? HCG ( Human Chorionic Gonadotropin) is often called the pregnancy hormone because it is made by cells formed in the placenta, which nourishes the egg after it has been fertilized and becomes attached to the uterine wall. data sdni Levels can first be detected by a blood test about 11 days after conception and about 12-14 days after . samsung evo 860 250gb