There are several clinical methods to rule out ectopic pregnancy: 1) Blood HCG test, because in the early stage of ectopic pregnancy, it is difficult to detect the location of the gestational sac by ultrasound, so it is often necessary to check the blood HCG to initially determine whether there is a possibility of ectopic pregnancy. If the result of blood HCG doubles on the basis of the original one, the possibility of ectopic pregnancy can be basically excluded. 2. Since it is difficult to diagnose ectopic pregnancy in the early stage, if the gestational sac can be seen in the uterus at about 40 days after menopause through ultrasound examination, the possibility of ectopic pregnancy can be clinically ruled out.