The decision to perform a medical abortion is based on ultrasonography and HCG measurement to determine if the pregnancy is normal in utero. A delay of five days in menstruation may also be a manifestation of a normal menstrual cycle that is wrong. Clinically, a delay of seven days in menstruation may also be a normal clinical manifestation, so a simple delay of five days in menstruation cannot determine if it must be pregnancy, and a blood HCG test is needed to determine if it is. At the same time, if you want to have a medical abortion, you must make sure that the pregnancy is normal in the uterus after the ultrasound examination, and only then you can have a medical abortion.