The absence of vomiting at 8 weeks of pregnancy is usually a normal physiological phenomenon. The degree and duration of pregnancy reflection may vary with each person’s system. If you do not throw up at 8 weeks of pregnancy, it may also be a pathological condition, then you need to go to the hospital as soon as possible for ultrasound examination to understand the development of the fetus.1. Physiological phenomenon: It may be because the level of progesterone in the body of pregnant women is low, so the pregnancy vomiting disappears. Usually in the first 3 months of pregnancy, pregnant women experience nausea, vomiting, drowsiness, chest pain, loss of appetite and other pregnancy reactions, but due to the age and physical condition of pregnant women, the duration and intensity of pregnancy reactions are different, and the pregnancy vomiting may disappear at 8 weeks of pregnancy; 2, pathological phenomenon: some women’s early pregnancy reactions disappear suddenly at 8 weeks of pregnancy, which may be caused by embryonic abortion. Therefore, if the pregnancy reaction suddenly disappears, you need to go to the hospital for an ultrasound examination to understand the development of the fetus. If the ultrasound examination shows that the fetus is normal, there is no need to worry too much. During pregnancy, it is enough to pay attention to rest, strengthen nutrition and eat a diet high in protein, vitamins and easy to digest. In addition, during pregnancy, try to stay away from polluted environment and avoid exposure to chemical agents or strong radiation to avoid affecting the health of the fetus.