In the first trimester of pregnancy, getting up in the morning and vomiting yellow water is a physiological manifestation. It is normal to have nausea, vomiting, abdominal distention, and weakness due to the elevated blood HCG in the body, which causes pregnancy reactions. These reactions should last until the 3rd month. After the 3rd month of pregnancy, these symptoms will gradually disappear or be partially relieved. You should try to pay attention to a light diet and not to eat foods that are too greasy and stimulating to avoid aggravating the stomach and causing nausea and vomiting due to indigestion.