If there is no yolk sac on the 45th day of menopause, you can observe the pregnancy for another week for rechecking, and if there is no yolk sac on the rechecking, you have to determine whether it is an ectopic pregnancy through the examination of the posterior fornix of the vagina. Generally, the yolk sac can be seen in the uterine cavity through ultrasound examination at about 42 days after menopause. Some women with long menstrual cycles, late ovulation, and late fertilization of the egg, may be delayed by one week to review the test can be detected. If the yolk sac cannot be seen in the uterine cavity even after one week of delay, it is necessary to consider ectopic pregnancy, go to the hospital through the posterior vaginal fornix puncture examination, puncture and draw out the non-coagulated blood, accompanied by the drop of HCG can basically determine the ectopic pregnancy, but also through the laparoscopy, diagnostic scraping way to determine whether the ectopic pregnancy. Fertilized ovum in the uterine cavity outside the bed is called ectopic pregnancy, customarily called ectopic pregnancy. Ectopic pregnancy is most common in tubal pregnancy, and the typical clinical manifestations are menopause, abdominal pain, and vaginal bleeding. Ectopic pregnancy is an abnormal pregnancy, once diagnosed timely termination of pregnancy treatment. During pregnancy, pay attention to more rest, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, the doctor clear diagnosis, and cooperate with the doctor symptomatic treatment.