Pregnancy uterine fluid 8mm*4mm is usually not serious, but there are individual differences. Early pregnancy through urine or blood pregnancy test to clarify pregnancy, but also in about 6 weeks after menopause to do ultrasound examination to clarify intrauterine pregnancy, and can understand the embryonic development. When the ultrasound suggests 8mm*4mm uterine fluid, but the embryo is well developed, and the pregnant woman does not have much vaginal bleeding, progesterone and blood HCG (human chorionic gonadotropin) levels are normal, it is usually not serious. However, when the ultrasound examination suggests that there is fluid in the uterine cavity, if the embryo is not well developed, or if the pregnant woman has frequent abdominal pain and heavy vaginal bleeding, then the risk of miscarriage is higher, and active fertility preservation treatment can be given as prescribed by the doctor. When the symptoms do not improve or worsen after treatment, ultrasound examination of the embryo development is still no significant growth, need to promptly terminate the pregnancy. In addition, pregnancy uterine fluid 8mm * 4mm need to be actively dealt with under the guidance of the doctor.