How many days does menstruation defer to just calculate normal at most

Under normal circumstances, menstruation can not be delayed for more than seven days. If menstruation is delayed for more than seven days, the possibility of pregnancy should be considered first. It is necessary to see a doctor in time to check the HCG situation in the blood. It may also be caused by menstrual disorders. It is recommended to do color Doppler examination to clarify the cause.