Some naturally have lower levels than others. Also, these levels can vary from woman to woman in early pregnancy. The levels of hCG are very low in the days immediately before and after the first missed period. Tests that can detect smaller concentrations of hCG in the urine are more likely to show positive results earlier. ![]() Home pregnancy tests work by detecting hCG levels during the first trimester of pregnancy. ![]() At the end of the first trimester, hCG levels fall. The body’s hCG levels rapidly increase during the first trimester, generally doubling every 48–72 hours. The body then starts to produce a hormone called human chorionic gonadotropin (hCG). Pregnancy begins when a fertilized egg implants in the lining of the uterus.
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