After embryonic arrest, early pregnancy tests will show a fading phenomenon. This is because the embryo has stopped developing, and the level of human chorionic gonadotropin (HCG) in the body no longer rises but instead significantly declines. Early pregnancy tests work by detecting the amount of HCG in the urine. When embryonic arrest causes HCG levels to decrease, the result on pregnancy tests will gradually become fainter, even turning negative. It is advised that in cases of embryonic arrest, prompt miscarriage management or uterine evacuation should be conducted to prevent potential inflammatory gynecological conditions and impacts on the woman's clotting function.