Fluid accumulation in the gestational sac may be caused by inflammatory stimulation, preeclampsia, embryonic dysplasia and other reasons, which will have an impact on pregnancy, and most of the cases are more serious. 1. Inflammatory stimulation: if a pregnant woman has vaginal inflammation, the upward infection of pathogens will affect the endometrium, causing it to produce inflammatory exudation, manifesting itself as effusion in the gestational sac, which will lead to abnormal embryonic development, and it is more serious. 2 preeclampsia: pregnancy check fluid in the gestational sac may be the result of preeclampsia blood accumulation, such cases are more serious, pregnant women may also be accompanied by abdominal pain, vaginal bleeding and other symptoms. 3. Embryonic dysplasia: If the progesterone secretion in the pregnant woman’s body is insufficient, it will lead to delayed development of the embryo, so that there is fluid in the gestational sac, at this time, if the fluid can be absorbed, it means that it is not serious for the time being, and if the accumulation of fluid continues to increase, it means that there may be chromosomal abnormalities in the fetus, which is more serious. If a pregnant woman has fluid in the gestational sac, accompanied by the above symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examinations, to clarify the cause of the disease, and symptomatic treatment.