Generally within 12 weeks of pregnancy, that is, within the early trimester, is the time when embryonic abortion is most likely to occur. Because the embryo is not very tightly bound to the uterus in the early pregnancy, any unfavorable factors may cause embryonic abortion, such as adverse external stimuli, influence of medications, emotional ups and downs, presence of systemic systemic diseases such as high age and first birth, high blood pressure, immune system diseases, blood system diseases, and poor local blood circulation, and other maternal factors may lead to embryonic abortion. In addition, the process of conception has the characteristic of superiority and inferiority, if the couple has poor quality sperm and eggs, chromosomal abnormalities, poorly developed chorionic villi, and hereditary diseases that lead to embryonic maldevelopment, embryonic abortion may also occur.