Empty sacs usually have HCG around 100 IU/L. HCG refers to human chorionic gonadotropin, which begins to be secreted after the fertilized egg has been deposited, and the development of the embryo can also be determined by monitoring the HCG value. When the ultrasound suggests an empty sac, it suggests that the embryo is underdeveloped, and at this time, the HCG level is mostly maintained at around 100 IU/L. In early pregnancy, you must pay attention to proper rest, no strenuous exercise and exertion, and take folic acid on time as prescribed by the doctor. Avoid unauthorized use of medication and contact with toxic and harmful substances, such as formaldehyde, X-ray, etc., so as not to affect the development of the embryo. When the ultrasound examination of poor embryonic development, can be combined with the results of blood HCG and progesterone to timely treatment of fertility preservation, if necessary, need to terminate the pregnancy in a timely manner, need to be under the guidance of the doctor to give targeted treatment.