If the fluid in the pregnancy sac is treated actively, it can usually disappear in about half a month, but there may be individual differences in the exact time. If the amount of fluid in the gestational sac is relatively small, without abdominal pain, lumbar distress and other symptoms, you can under the guidance of the doctor for fertility preservation treatment, usually in about half a month can disappear. If the amount of fluid in the gestational sac is large and increasing, or if there is lower abdominal pain with vaginal bleeding, it is necessary to have absolute bed rest and hospitalization for fertility preservation treatment. If the effect of birth control is good, it can disappear in 3 months; if the effect of birth control is poor, miscarriage occurs. There are many reasons for fluid retention, the most common of which are exertion, strenuous exercise, etc. It may also be related to infection, embryonic dysplasia, uterine abnormalities, etc. If the fluid retention increases further, it may lead to miscarriage. If it increases further, it may lead to serious consequences such as embryonic arrest and miscarriage. Pregnant women are advised to take obstetric checkups on time, take proper rest, and prohibit sexual intercourse in the early stage. If the fluid buildup in the gestational sac continues unabated, timely medical attention is required.