When there is no yolk sac at about 5 weeks of pregnancy, you can follow the doctor’s advice to check again, but there is no need to keep the baby at 8 weeks of pregnancy if there is still no yolk sac. Empty sac refers to empty gestational sac, which is the development of fertilized egg is affected by abnormality, and stops developing before forming embryo, that is to say, it will not grow germs again. Empty sacs are mainly diagnosed by ultrasound, and can be observed appropriately when they are found. If the average diameter of the empty sac is larger than 2.5~3 centimeters and there is still no bud, it is diagnosed as embryonic failure, which suggests that the pregnancy has failed and abortion can be performed. Spontaneous abortion occurs with the cessation of embryonic development in some empty gestational sacs. If the embryonic tissue can be completely expelled, vaginal bleeding decreases, and ultrasound confirms that there is no embryo remaining in the uterus, the procedure can be avoided, otherwise, the uterus needs to be cleared. In addition, it is recommended that patients with empty gestational sacs go to the hospital in time, do the relevant examinations to clarify the cause of the disease, and then follow the doctor’s instructions for treatment to avoid the same situation in the next pregnancy.