The fetal bud and fetal heart are important criteria to determine whether the embryo is developing well and whether the gestational sac is alive, but the early or late appearance of the fetal bud and fetal heart has no obvious relationship with the good or bad fetus. The early appearance of fetal bud and fetal heartbeat is related to the physical condition of the pregnant woman, the regularity of her menstrual period and the development of the gestational sac itself. Usually, the appearance of fetal bud and fetal heartbeat from about 50 days of menopause indicates a well-developed embryo, while some people have fetal heartbeat appearing at about 9 weeks. As long as the fetal bud and fetal heart appears within the normal time range, it means that there is no problem with the development of the embryo and the pregnant woman should not be too nervous. If no fetal bud or heartbeat appears within the normal time frame, consider whether the embryo has stopped developing. Fetal arrest is often accompanied by abdominal distension, abdominal pain, vaginal bleeding and other symptoms. If symptoms of suspected fetal arrest appear, go to the hospital immediately for ultrasound examination and ask a professional doctor for diagnosis and symptomatic treatment.