In the early stages of embryonic development, the fetal bud and fetal heart tube beat can be seen by ultrasound, and can appear as early as 6-8 weeks. However, there are individual differences, and women who usually have irregular periods or relatively long menstrual cycles may conceive later and therefore the appearance of fetal heart tube beats will be later, often no later than 10 weeks. Some women are well enough to have a vaginal ultrasound and can usually monitor fetal heart tube beats 4-5 weeks after fertilization. If no fetal heartbeat is detected beyond 10 weeks, excluding the wrong last menstrual period, you should be alerted to the fact that the embryo has stopped developing and promptly go to the hospital for relevant tests to clarify the diagnosis. In order to avoid embryonic dysplasia, we should also pay attention to the following matters during pregnancy: 1) avoid radioactive examinations in daily life and observe whether there is blood flowing out of the vagina; 2) keep a happy mood and avoid injuries, drugs, smoking, alcohol, exertion and actions that increase abdominal pressure; 3) pay attention to a reasonable diet and avoid oily and stimulating foods. 4. Pay attention to the supplementation of folic acid, which can prevent fetal neural tube malformation in the early stage of pregnancy, i.e. within 12 weeks of pregnancy; 5. Conduct regular maternity checkups and deal with any abnormalities in time.