If early in pregnancy, ultrasound indicates that the accumulation of blood in the uterine cavity is actually a manifestation of pre-eclampsia. First, the blood accumulates in the uterine cavity, and then to a certain extent, the accumulation of blood in the uterine cavity is discharged, and it manifests itself as vaginal bleeding, so it is not yet time to discharge it, and there will be accumulation of blood in the uterine cavity. In many cases, it can recover on its own, it can be absorbed on its own. If the fetal heartbeat and fetal bud are out, the fetal heartbeat is quite good, and the blood accumulation will be absorbed slowly. But if there is a lot of bleeding, which eventually turns into vaginal bleeding, and then the pregnancy tissue is discharged, this is not good, so the accumulation of blood in the uterine cavity needs rest and fetal preservation.