Many women will have early pregnancy reactions in early pregnancy, such as nausea, vomiting, breast tingling, salivation, drowsiness, aversion to grease, loss of appetite, etc. Some women may feel no pregnancy as a normal phenomenon, but it is not excluded that it is an abnormal phenomenon, which is related to personal constitution. 1. normal phenomenon: some women have no clinical symptoms of early pregnancy at all, the same pregnancy week, the same blood human chorionic gonadotropin, the severity of early pregnancy reactions varies from woman to woman. The severity of early pregnancy reaction is completely different among different women, depending on their own psychological quality, whether they are particularly anxious or prone to nervousness, etc. All the above factors will affect early pregnancy reaction, which is usually normal. If all the embryo growth and development are found to be good through ultrasound examination, there is no need to worry excessively and no special treatment is needed; 2. abnormal phenomenon: some women have obvious and serious early pregnancy reaction in early pregnancy, and then the early pregnancy reaction suddenly disappears, it is recommended to have ultrasound examination in time, such women are more sensitive to the changes of human chorionic gonadotropin in blood, when the embryo stops developing, due to When the embryo stops developing, the early pregnancy reaction will naturally decrease or even disappear completely due to the decrease in the level of human chorionic gonadotropin and the corresponding estrogen and progesterone, which may lead to no feeling of pregnancy, and this condition should be alerted and detected early to avoid dangerous consequences. Pregnant women need to pay attention to take folic acid before and after pregnancy as prescribed by the doctor, and also conduct regular maternity checkups, avoid contact with toxic or radioactive substances, ensure a relaxed mood, and exercise appropriately to make the labor process smoother.