HCG does not rise before a woman’s normal period, and if a woman’s blood test for HCG rises before the onset of menstruation, it can only mean that she is pregnant, and HCG will only rise after the formation of a fertilized egg.HCG is called human chorionic gonadotropin, and it is a protein hormone secreted by the trophoblast cells of the placenta, and the placenta will start to secrete HCG on the seventh day of the formation of a fertilized egg. If there is no fertilized egg, there is no placenta and no HCG will be produced. on the 10th day after the formation of the fertilized egg, HCG can be detected in the mother’s blood, which means that the fertilized egg has been formed and she is pregnant, and will not have a normal menstrual period. If HCG is elevated and vaginal bleeding occurs, the bleeding may be caused by the pregnancy, either an intrauterine miscarriage or irregular vaginal bleeding caused by an ectopic pregnancy. To clarify whether it is an intrauterine or ectopic pregnancy, you must go through a gynecological ultrasound.