An echogenic zone below the gestational sac suggests the presence of uterine blood, which may be due to preeclampsia or subchorionic hematoma. Early pregnancy ultrasound suggests that the absence of an echogenic zone below the gestational sac indicates the presence of blood in the uterine cavity, which may be due to preeclampsia or subchorionic hematoma. Progesterone and HCG (human chorionic gonadotropin) levels are also used to assist in the diagnosis, and progesterone and other medications to preserve the fetus should be given under the direction of the doctor if necessary. Early pregnancy when the placenta has not yet formed, embryonic development is not yet stable, must pay attention to appropriate rest, can not carry out physical labor and strenuous exercise, appropriate increase in diet and nutrition, and continue to take folic acid on time. When abdominal pain, vaginal bleeding, embryonic dysplasia and other conditions need to go to the hospital in time, and follow the doctor’s instructions to preserve the fetus treatment. When the ultrasound examination suggests that there is a non-echoic area underneath the gestational sac, you need to be treated under the guidance of your doctor and be re-examined on a regular basis.