Embryo arrest, also known as missed abortion, refers to the influence of various factors on the growth and development of the gestational sac in early pregnancy, resulting in the absence of a fetal heartbeat. In the early stages, embryo arrest is imperceptible, as it often shows no signs. It is incorrect for some women to judge embryo arrest based on the presence of abdominal pain or changes in pregnancy reactions. Reactions to embryo arrest only appear after a certain period. When the embryo has been arrested for a longer period, the body may treat the gestational sac as a foreign object and attempt to expel it. This situation may present symptoms of threatened miscarriage, such as abdominal pain and vaginal bleeding. Under these circumstances, one can visit the hospital for an ultrasound to assess the condition of the fetal heartbeat. The absence of a fetal heartbeat confirms the presence of embryo arrest.