At 2 months of pregnancy, which is 8 weeks of gestation, an ultrasound is usually performed to determine if the pregnancy is intrauterine. The ultrasound will show a fuller image of the uterus as well as the round echogenic area of the sac and the fetal buds in the uterine cavity, and the fetal heartbeat can be heard. However, in cases where the fat in the abdominal wall of the pregnant woman is thicker and affects the ultrasound penetration, or the location of the fetus is difficult to be captured by ultrasound, it may not be possible to confirm, and it is necessary to follow the doctor’s advice to review after 1-2 weeks: 1. uterus: in the second month of pregnancy, the uterus is slightly enlarged and fuller than usual under ultrasound examination, and the separation of the membrane lines in the uterine cavity can be seen; 2. gestational sac: in the second month of pregnancy, ultrasound examination usually The gestational sac located in the uterus can be seen as a round echogenic area with clear edges in the uterine cavity, and the round lateral echogenicity can be slightly stronger than the medial one. The gestational sac is usually more than 2 cm, and a mid-sagittal section of the fetus can be obtained, at which time the fetus is often in a classical highly flexed state; 3, fetal bud: in the second month of pregnancy, the basic fetal shape has been established, and the fetal bud can be divided into head, trunk and limbs, usually the head is larger than the trunk. The fetal heartbeat has a normal frequency of 120-160 beats per minute and is strong and powerful. If the pregnant woman has irregular menstruation on weekdays, she may not hear the fetal heartbeat, so she can be rechecked after 1-2 weeks. If no embryonic sac is found in the uterus at this time and there is a mass outside the uterus with a fetal sac-like dark area or even a fetal heartbeat, then ectopic pregnancy should be considered. However, if an ectopic pregnancy cannot be determined because the fallopian tube has not yet been enlarged, it is necessary to wait 1 week for a follow-up examination to avoid misdiagnosis.