When a woman is examined by ultrasound after pregnancy, she will find residual uterine fluid. Generally, if the situation of non-absorption of uterine fluid is more serious, it will easily trigger the embryo to stop developing. This is due to the causes of non-absorption of uterine fluid, as follows: First, the accumulation of blood in the uterine cavity. The accumulation of blood is mainly due to the phenomenon of bleeding caused by the peeling of the human uterine wall and the chorionic membrane. This phenomenon can lead to the formation of fluid in the uterine cavity while the absorption becomes poor, which may affect the development of the embryo, so timely treatment is needed. Secondly, injury leads to accumulation of blood. In some people, bleeding occurs in the early stages of pregnancy when there is a miscarriage if not properly cared for. This blood, if left in the uterine cavity, will also cause the uterine fluid to be unabsorbed. If the accumulation of blood is relatively large, it will affect the gestational sac, causing the development of the sac to become poor, thus causing fetal arrest. Finally, non-absorption of fluid in the uterine cavity can also be a factor that triggers fetal abortion and causes miscarriage. Once the fluid in the uterine cavity is found not to be absorbed, it should be treated in time, and it is recommended to take proper rest and actively cooperate with the treatment. You can also take relevant fetal preservation drugs to prevent miscarriage and fetal abortion.