If the embryo stops developing for half a month and then has a fetal heart, this is mostly due to the influence of the length of the menstrual cycle and the period of ovulation, at which time the fetal heart has not yet appeared, and the ultrasound is done at a relatively early time, so that the fetal heart is not detected. In short, it is not that the fetus stops for half a month, just that the fetal heart is not detected at the beginning. 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 examination. If no fetal heartbeat is observed for more than 2 minutes, the blood can also be tested for human chorionic gonadotropin, and a further definitive diagnosis can be made based on the doubling of the hormone. If there is no diagnostic error, it is unlikely that there will be a fetal heartbeat half a month later after a definitive stoppage. In the case of abnormalities such as “fetal heartbeat after half a month”, it is necessary to go to the obstetrics department of a regular hospital for gynecological and ultrasound examinations to make a clear diagnosis and then follow the doctor’s instructions. If the past is a misdiagnosis, this time to determine is still alive, need to be compared with the gestational week to see whether there is embryonic developmental delay, all good can continue the pregnancy, pay attention to regular obstetric examination, found discomfort to the hospital in time to see the doctor. If the pregnancy is abnormal, it is necessary to terminate the pregnancy in time.