How long can HCG be pregnant?

Blood hcg test can be the earliest in menopause about 3 days or about a week after cohabitation, you can judge whether pregnant, blood hcg test accuracy is relatively high. Urine hcg content is not high in blood hcg content, so for early pregnancy test, accuracy is not high. Blood hcg test can only be used to check whether pregnant, can not be used to judge whether it is intrauterine pregnancy.