Pericystic fluid refers to the accumulation of fluid around the blastocyst formed by the fertilized egg of a pregnant woman. Generally, a small amount of physiological effusion is normal. If the fluid accumulation is relatively large and there is no obvious discomfort, it does not matter. However, if it is accompanied by abdominal pain and back pain, you should go to the hospital for relevant examinations, such as ultrasound and endocrine hormone levels, in order to avoid causing preterm abortion. During the first trimester, it is important to take more rest and not to exercise strenuously. The diagnosis and treatment will be decided according to the nature and amount of pericapsular fluid, as well as other clinical manifestations.