Before the fourth month of pregnancy, since the patient cannot perceive fetal movement, trying to determine whether the fetus is viable or not mainly relies on the patient’s clinical symptoms. If the patient has nausea, vomiting and other early pregnancy reactions, but the early pregnancy reactions suddenly disappear, this situation suggests that the embryo may be at risk of death. In addition, if the patient has stomach pain, abdominal drop, or vaginal bleeding, this suggests the possibility of embryo death. However, clinical symptoms cannot accurately determine whether the embryo is alive or not, and ultimately we still need to rely on ultrasound for diagnosis. After the fourth month of pregnancy, the patient can generally feel the fetal movement, so this time the patient is mainly through the observation of fetal movement, to determine whether the fetus is alive. As long as the fetal movement is normal, it usually indicates that the fetus is relatively safe and does not need to worry too much. If the fetal movement is abnormal or disappears, it suggests that the fetus has abnormalities, or there is a possibility of stillbirth.