Blood accumulation in the uterine cavity during pregnancy but no bleeding, usually during ultrasound examination, suggesting a liquid dark area in the uterine cavity, presumed to be fluid accumulation in the uterine cavity as blood accumulation in the uterine cavity, but because the cervical opening is not open at that time, the blood accumulation in the uterine cavity cannot be discharged, so no bleeding. The clinical consideration is that it is caused by pre-eclampsia miscarriage, which needs to be actively treated to avoid bad pregnancy outcome, and the following points are often taken: 1. bed rest: pregnant women are advised to rest in bed, avoid physical labor and sports, and avoid sexual intercourse; 2. keep good mood: bad mood stimulation may stimulate uterine contraction and affect the effect of fetal preservation treatment, pregnant women should be instructed to relax and listen to light music to ease their attention. We need to instruct pregnant women to relax, listen to light music to relieve their attention and keep good mood; 3.Medication: if the progesterone is insufficient and causes preterm abortion, progesterone treatment should be given appropriately. A small amount of accumulated blood after fetal preservation treatment may be absorbed in the uterine cavity or expelled out of the body. Pregnant women should pay attention to observe the vaginal bleeding. If vaginal bleeding increases with paroxysmal lower abdominal pain and ultrasound examination indicates embryonic dysplasia, it indicates that miscarriage is unavoidable and the doctor will consider terminating the pregnancy to allow complete expulsion of the embryo and placental tissue as soon as possible.