Some pregnant women may be too sensitive to smell because of their poor gastrointestinal digestion, or they may have chronic diseases that cause nausea and vomiting. If the early pregnancy reaction is serious, dizziness, weakness, loss of appetite, nausea, vomiting, drowsiness and other symptoms may occur. Pregnancy vomiting has a lot to do with genetics, pregnancy vomiting is a normal phenomenon, do not have too much psychological pressure, keep a happy mood, if more serious to go to the hospital to check the body.