The situation where there is no fetal heart at 70 days but it appears at 80 days is mainly influenced by the length of the menstrual cycle and ovulation, which results in the late appearance of the fetal heart, while the ultrasound is done to detect it at a relatively early stage, so it’s not that there is no fetal heart at 70 days, it’s just that the heart wasn’t detected at the beginning. Another rare situation is a diagnostic error. In the early stages of pregnancy, to observe whether the embryo has stopped developing, it is necessary to observe the fetal heartbeat for more than 2 minutes during the ultrasound. If there is no fetal heartbeat for more than 3 minutes, it is better to test the blood for human chorionic gonadotropin and make a comprehensive judgment based on the doubling of the hormone. If there is no fetal heartbeat at the beginning and then it appears again, you should return to the clinic after a week to clarify the development of the embryo by means of gynecological ultrasound, hormone tests and other examinations. If it is determined that the fetus is alive, it is necessary to compare it with the gestational week to see if there is a delayed development of the embryo, or if the embryo was born late and is now developing normally. If it is the cause of delayed embryonic development, appropriate fertility preservation treatment needs to be carried out, such as the use of terbutaline, kidney stabilizing pills and other proprietary Chinese medicines. If the gestational week and the time of menopause match and the embryo develops normally, the pregnancy can be continued, only need to pay attention to regular obstetric examination, and find discomfort to the hospital in time.