It is a normal pregnancy reaction to feel weak and tired after pregnancy. The pregnancy reaction is caused by the secretion of human chorionic gonadotropin from embryonic trophoblast cells in large quantities after pregnancy, which manifests as nausea and vomiting, drowsiness, fear of cold, weakness, depression, reduced appetite and other symptoms, which are normal physiological reactions. It is recommended to pay attention to rest during early pregnancy, not to stay up late, avoid strenuous exercise, pay attention to reasonable diet, pregnancy reaction will reduce appetite, mainly light diet, eat more vegetables and fruits, pay attention to folic acid supplementation, which can effectively prevent neural tube malformation of the fetus. It is forbidden to have intercourse during early pregnancy.