Fluid in the uterine cavity of pregnancy may be related to gynecological inflammation, and in severe cases, it can also cause preterm miscarriage. Under normal circumstances, there is no fluid inside the uterine cavity in pregnancy, and the symptoms of fluid in the uterine cavity may be related to one’s gynecological inflammation. Generally speaking, if the fluid inside the uterine cavity is detected at the beginning of pregnancy, if the amount of fluid is very small, does not affect the body, and does not cause any discomfort, then you can not worry about it. If there is too much fluid inside the uterine cavity, it will cause symptoms of preeclampsia, such as back pain, abdominal pain, vaginal bleeding and other symptoms. If there is too much fluid in the uterine cavity, you should pay attention to it and go to the hospital for further examination to prevent the phenomenon of preeclampsia, take proper measures to protect the fetus, rest in bed and avoid exertion.