If there is fluid in the uterine cavity at 6 weeks of pregnancy, it is considered that there is a possibility of preeclampsia, appropriate rest can be given, and medication can be given if necessary. Abdominal pain, vaginal bleeding and other symptoms, some pregnant women only show ultrasound fluid in the uterine cavity, the causes of preterm miscarriage are very diverse, may be related to the development of the embryo itself, the immune factors between the fetus and the mother, or low progesterone, too much fatigue, or the pregnant woman’s own underlying diseases, some preterm miscarriage can not find any cause. For preeclampsia, follow the doctor’s advice to take proper rest, prohibit coitus, and if necessary, give progesterone, dydrogesterone and other medications to protect the fetus. Monitor blood HCG and progesterone and estrogen changes, while ultrasound dynamically monitors the condition of uterine fluid. When 6 weeks pregnant ultrasound examination of the uterine cavity fluid can be actively dealt with under the guidance of the doctor, the use of drugs need to comply with medical advice.