The chances of preserving the fetus in pregnancy with blood in the uterine cavity depend on the specific condition of the mother. If the fetal heartbeat is normal and the amount of blood is not large, the chances of keeping the fetus are higher. The accumulation of blood in the uterine cavity and the vagina is usually not flowing out of the body and can be easily ignored. In clinical practice, whenever accumulation of blood in the uterine cavity is found, regardless of the test results of indicators such as HCG and progesterone, fetal preservation treatment should be carried out. However, if the accumulation of blood is found to be increasing, gradual abruption of the placenta will lead to the occurrence of unavoidable miscarriage, but the chance of such phenomenon is small. Pregnant women with blood in the uterine cavity should avoid excessive worries, cooperate with the doctor for all examinations and use drugs such as progesterone or diprogesterone as prescribed by the doctor to avoid adverse effects on the fetus to the greatest extent possible.