Fluid accumulation next to the gestational sac indicates accumulation of blood in the uterine cavity. Fluid accumulation may be caused by the implantation of the fertilized egg, or it may be caused by pre-miscarriage or abnormal development of the fetus. A small amount of fluid next to the gestational sac found on ultrasound in early pregnancy may be due to physiological bleeding produced during the process of fertilization of the egg, usually the amount of fluid is small, and there is no need for special treatment at this time. If there is a miscarriage or abnormal fetal development in early pregnancy, fluid may also be found under the ultrasound of the gestational sac, need to dynamically look at the ultrasound, to assess the changes in the fluid, and if necessary, to carry out progesterone and other fertility preservation treatments. When a pregnant woman finds fluid next to her gestational sac, she needs to go to the obstetrics and gynecology department immediately, and under the doctor’s guidance, according to the amount of bleeding and the blood HCG test to comprehensively determine the condition of the fetus and the pregnant woman, and if necessary, carry out abortion preservation or terminate the pregnancy.