Empty gestational sac refers to the presence of an empty gestational sac in the uterine cavity at about 50 days of menopause, with no germ inside the sac and therefore not able to develop into a normal embryo. Most of the empty gestational sacs are caused by the poor quality of the fertilized egg or the poor quality of the egg and sperm, the presence of serious chromosomal lesions and other reasons that do not develop into a normal embryo, also known as embryonic abortion or spontaneous miscarriage, can only be removed through abortion or medical abortion, the empty gestational sacs in the uterine cavity of women will lead to bleeding in the uterine cavity and cause infection in the uterine cavity. In a few cases, if a woman has a short menopause and there is an empty gestational sac in her uterus, she can have an ultrasound examination after 7 days or so, and if there is a fetal bud growing in the uterus, it is caused by the slow development of the embryo and can be reviewed regularly.