If only the gestational sac is seen in the uterus by ultrasound and the yolk sac is seen in the gestational sac and no germ tissue is seen, clinically there are several possible meanings: first, the pregnancy is relatively short and the gestational product has not developed to the extent that the germ can be seen, so only the yolk sac is seen in the gestational sac, which is a normal phenomenon, and it is recommended that ultrasound be given after a week This is normal and it is recommended to give an ultrasound examination after one week, and often the germ tissue will be seen. Secondly, for some reason the embryo has stopped developing, so clinically the embryo bud is not visible, only the yolk sac is visible. If blood is drawn to check the blood HCG and the blood is drawn again every other day, the rise of the blood HCG is not satisfactory, so clinically the diagnosis of embryo arrest can be made, and it is also recommended to perform the operation to remove the uterus as soon as possible.