In the event of threatened miscarriage or fetal developmental arrest, the first symptom to appear is vaginal bleeding, which is a very important sign. Mainly, the uterus expels the fetus that has stopped developing based on the principle of natural selection. Another symptom that may occur after embryonic arrest is pain in the lower abdomen, which is also common. Furthermore, after embryonic arrest, the hormones secreted in the body will gradually decrease, leading to a reduction or disappearance of early pregnancy reactions such as nausea, vomiting, loss of appetite, and breast tenderness in pregnant women. It is crucial to address fetal arrest promptly and to regularly conduct prenatal check-ups during pregnancy to monitor the health of the fetus.