Drinking water does not affect the results of the HCG blood test. The concentration of HCG in a woman’s body rises significantly after pregnancy, and it increases exponentially every day during early pregnancy as the duration of pregnancy increases. The results of the test are mainly affected by the time of pregnancy and the quality of the embryo, and have nothing to do with drinking or eating, so it is not necessary to fast when you go to the hospital for the HCG blood test, and you can do it at normal times. However, if the HCG doubling does not work or does not rise, there is a possibility of miscarriage.