When there is a germ without a primitive heartbeat, the ultrasound should be reviewed after a period of time, which may be due to irregular menstruation in a pregnant woman or late implantation of the fertilized egg. Heart tube beats usually appear 2 to 3 days after the appearance of the fetal bud echoes. As the weeks of pregnancy increase, the heart tube beats become more pronounced and stronger. The ultrasound may be repeated one week later if no heartbeat is seen. If there is no heartbeat thereafter, or if there is a bud or heartbeat at the beginning of the examination, but the heartbeat gradually disappears with the increase of gestation weeks, or even the buds have atrophy, then it suggests that the embryo is not well developed, or the embryo stops developing. Some patients will have some manifestations of preeclampsia. Fetal arrest should be treated immediately upon diagnosis. It is recommended that pregnant women should take obstetric checkups on time, and if there is no fetal heartbeat for a long time, it should be considered that the fetus has stopped developing, and should seek medical treatment in time, consult with a professional doctor, and take professional measures to treat the condition.