After the presence of the fetal heart and buds, it is possible that embryonic arrest may also occur. There are many reasons for this, the most common ones being: i. Insufficient chorionic gonadotropin levels. After pregnancy, the fetal heart and buds appear, but the chorionic villi do not grow vigorously enough, and the chorionic gonadotropin level is relatively low, which is also prone to embryonic arrest. Second, the uterine artery blood supply of the pregnant woman is not good. If the fetal heart appears and the chorionic gonadotropin level is enough, but if the uterine artery blood supply of the pregnant woman is very poor, it is also prone to embryonic abortion. Third, the embryo itself is not well developed. Sperm and egg in the process of fertilization there may be certain problems, the embryo quality is not good for fetal arrest is superior. So after there are fetal heart and buds, there is a possibility that embryonic arrest may also occur.