Generally speaking, ectopic pregnancy can be ruled out after 5-6 weeks of menopause with regular menstruation. Ectopic pregnancy is usually detected by vaginal ultrasound. In women with regular menstrual periods, the gestational sac can be seen as early as 5 weeks into the pregnancy, and the primitive fetal heartbeat can be seen at 6 weeks, at which point vaginal ultrasound can confirm the diagnosis of ectopic pregnancy. If no gestational sac is found in the uterine cavity, and a gestational sac is found in other parts of the uterus, or primitive heart tube beats, the diagnosis of ectopic pregnancy can be confirmed. However, even if the sac and primitive heart tube pulsation are found in the uterine cavity, ectopic pregnancy cannot be completely ruled out, and there may be a compound pregnancy, especially after the use of ovulation stimulating drugs, which needs to be taken more seriously. It is recommended to combine with ultrasound to strictly investigate the possibility of the presence of intrauterine and extrauterine gestational material, in order to avoid the adverse prognosis brought about by the missed diagnosis. In general, since the gestational sac and primordial heart tube pulsation can be clearly detected by ultrasound at 6 weeks of pregnancy, ectopic pregnancy can be excluded if the above tissues are not found outside the uterus at 6 weeks of pregnancy.