It is recommended that blood be drawn to check the levels of human chorionic gonadotropin and progesterone. Human chorionic gonadotropin can evaluate the activity of the embryo, and if the embryo is not developing well or the progesterone level is too low, it may lead to the accumulation of blood in the uterine cavity. If necessary, progesterone can be injected intramuscularly. 2. Take proper rest and do not engage in too much activity. 3. Regularly review human chorionic gonadotropin, progesterone level and ultrasound, and if necessary, hospitalize for fetal preservation treatment.