During the period of embryo implantation, some women experience flu-like symptoms, which usually last for about a week. After successful fertilization of the sperm and egg in the fallopian tube, they move towards the uterine cavity with the help of peristalsis and cilia movement in the fallopian tube and begin to slowly bury themselves in the uterine lining, where they develop underneath the uterine lining. This process is called implantation and takes about a week or so. After successful implantation, the trophoblast cells of the embryo will secrete a large amount of human chorionic gonadotropin, and you can go to the hospital to have a blood test to detect the value of human chorionic gonadotropin to determine whether you are pregnant or not. Early pregnancy is a critical period of embryonic cell differentiation, it is recommended to pay attention to rest, avoid overwork, try to avoid viral infections and ionizing radiation, do not take drugs.