A small amount of fluid in the uterine cavity will not affect the development of the fetus, while a large amount may affect the development of the fetus. After pregnancy due to the rupture of small blood vessels around the gestational sac, low progesterone content caused by bleeding, not discharged from the body will lead to the accumulation of fluid in the uterine cavity, the amount of fluid in the uterine cavity is relatively small, gradually absorbed by the body, without further increase will not affect the growth and development of the fetus. If the amount of fluid in the uterine cavity gradually increases, it means that the accumulation of blood is getting more and more, which may cause the embryonic tissues to be detached from the uterine wall and miscarriage may occur. Pregnancy with fluid in the uterus is usually recommended for fertility preservation and treatment with progesterone medication under the direction of a doctor. After two weeks to review the ultrasound, to see whether the bleeding is absorbed, bleeding in the gestational sac is becoming more and more serious, if the area increases accompanied by vaginal bleeding, abdominal pain symptoms, the success rate of fertility preservation is relatively small, the occurrence of inevitable miscarriage is more likely to be greater. Drugs are recommended to be used under the guidance of a doctor, and whether or not it will affect the fetus should be determined by examination in the hospital.