Early pregnancy with 9mm of fluid in the uterine cavity and no symptoms of abdominal pain is usually not serious, but symptoms such as abdominal pain and increased vaginal bleeding are more serious. Ultrasound is needed in early pregnancy to clarify normal pregnancy and to understand the development of the embryo. When the ultrasound indicates that there is intrauterine fluid of 9mm, it means that there is intrauterine bleeding. When there is no symptom such as abdominal pain, vaginal bleeding, and the level of progesterone and HCG (human chorionic gonadotropin) is basically normal, it is not serious and can be rechecked according to the doctor’s instruction. However, when there is fluid in the uterine cavity on ultrasound, and there are symptoms such as abdominal pain, vaginal bleeding, and low levels of progesterone and blood HCG, it is serious, and proper rest should be given as prescribed by the doctor, and progesterone and low molecular heparin should be given to protect the fetus, and the pregnancy can be continued when the symptoms get better and the ultrasound shows that the embryo is well developed. However, if the symptoms worsen or the blood HCG continues not to rise or fall, the risk of miscarriage is higher. Therefore, early pregnancy uterine fluid 9mm need to be actively treated under the guidance of the doctor, and review on time.