Whether a small amount of fluid in the uterine cavity in early pregnancy is serious or not depends on the condition of the embryo, whether the uterine fluid will increase subsequently, and whether there will be symptoms such as vaginal bleeding or abdominal pain. If there is a small amount of fluid in the uterine cavity in early pregnancy, but at this time, if the embryo grows and develops normally, and the fluid in the uterine cavity does not increase significantly, it is generally not too serious, and it will usually be absorbed on its own with the development of the fetus and the body’s metabolism, and basically it will not affect the health of the fetus. However, if there is much bleeding or vaginal bleeding in early pregnancy, it means that there is a possibility of preeclampsia, and then you should consult a doctor in time, and if necessary, carry out fertility preservation treatment. If the embryo is delayed in growth and development, the HCG value rises unsatisfactorily or even declines, and the fluid in the uterine cavity further increases, accompanied by abdominal pain, vaginal bleeding, etc., then we should consider the possibility of inevitable miscarriage, and at this time, the situation is relatively more serious, and should be sought at the earliest possible time. Therefore, if there is a small amount of fluid in the uterine cavity in the early stage of pregnancy, we should pay close attention to the presence of vaginal bleeding, abdominal pain and other symptoms, so as to facilitate timely medical treatment.