Liquid dark area seen in the uterus with a maximum internal diameter of 0.7cm, consistent with the size of a pregnancy of 4~5 weeks. When the pregnancy is about 4~5 weeks in size, you can’t see the fetal heart, buds and yolk sac, so the ultrasound description is liquid dark area in the uterus, maximum internal diameter 0.7cm, you need to draw blood for HCG to confirm the pregnancy before judging that it’s a gestational sac. If there are no symptoms of abdominal pain and bleeding during pregnancy, it is recommended to go to the hospital for further ultrasound examination at about 8 weeks of pregnancy, and there will be fetal heart, fetal buds and yolk sacs in the gestational sac at this time. Ultrasound examination of pregnancy in the uterus to see liquid dark area, the maximum internal diameter of 0.7cm, need to be examined and diagnosed by a doctor, by the doctor to develop individualized diagnosis and treatment plan, so as not to cause adverse consequences.