HCG measurement does not require fasting. The placenta secretes human chorionic gonadotropin after pregnancy, and the pregnancy can be determined by blood sampling. HCG is not affected by diet, and the HCG test can also determine whether the fetus is developing normally, ectopic pregnancy, and other conditions. Under normal circumstances, a blood test for HCG can be drawn around 14-16 days after intercourse to determine if you are pregnant, but some people are late in fertilization, so it is most accurate to draw blood around 15 days after intercourse. In early pregnancy, if the fetus is developing normally, the HCG will double every other day. If the HCG is too low or does not double through blood sampling, it may be a case of fetal dysplasia or ectopic pregnancy, which needs to be reviewed through blood sampling again, while ultrasound is recommended to check the development of the embryo, and posterior vault puncture can also be performed to determine ectopic pregnancy. If the fetus is underdeveloped, abortion is needed, and ectopic pregnancy requires timely surgery to avoid hemorrhage.