There is no fetal heart and germ but the gestational sac is still growing at 70 days of pregnancy. This is because although there is no fetal heart and germ, the gestational sac is still in bed in the uterine cavity and still has a blood supply, and the human chorionic gonadotropin level in the body has not dropped to normal, so the gestational sac will still grow. This phenomenon may be due to late conception or embryonic arrest. In general, if the average diameter of the gestational sac is greater than 2.5 cm and there is still no fetal heart and germ, it is considered that the embryo has stopped developing and it is recommended to terminate the pregnancy and not to continue waiting. However, for an accurate diagnosis it is still necessary to do 2 consecutive ultrasound dynamic observations combined with the results of the HCG (human chorionic gonadotropin) test. There are many causes of embryonic abortion, such as the presence of abnormal embryos, congenital chromosomal abnormalities, familial chromosomal disorders in those who have had multiple abortions; poor intrauterine environment is also a major cause of embryonic abortion, such as malformed uterine development, defective endometrium, endocrine disorders, etc.; if the pregnant woman suffers from anemia, malnutrition, hypertension, diabetes, heart disease, or the presence of Embryonic abortion may also occur if the pregnant woman suffers from diseases such as anemia, malnutrition, hypertension, diabetes, heart disease, or a history of previous exposure to radioactive environment, high temperature environment, tobacco and alcohol stimulation, or bad drugs. If embryonic abortion has been diagnosed, it is recommended to go to the hospital for abortion as soon as possible to remove the pregnancy tissue from the uterine cavity to terminate the pregnancy and prepare for a better next pregnancy. If the pregnancy tissue is not removed from the uterine cavity in time or incompletely, it can affect the next pregnancy.