Fertilization generally has no special sensation, and women may experience early pregnancy reactions such as nausea, vomiting, dizziness and fatigue by about the 6th week of pregnancy, which gradually disappear around 10 weeks. A week after the egg is fertilized, a few women will have early pregnancy reactions, while most women have no obvious clinical manifestations. Common early pregnancy reactions include nausea, vomiting, dizziness, fatigue, loss of appetite, drowsiness, aversion to greasy food, etc. Some women may experience mild breast tenderness. Women with regular menstruation who experience delayed menstruation with the above early pregnancy reactions can do early pregnancy test on their own to clarify the diagnosis of early pregnancy. Women with irregular periods and atypical symptoms can go to the hospital to have blood tests for HCG and vaginal ultrasound for a clear diagnosis. In addition, women who have the requirement of pregnancy are recommended to go to the hospital for prenatal examination in time, and women who do not have the requirement of pregnancy should terminate the pregnancy in time.