If you brush your teeth and vomit yellow water in the morning during pregnancy, the yellow water is caused by the rupture of capillaries in the gingival mucosa during the process of brushing. In this case, you can rinse your mouth with cool water to improve the phenomenon of rupture and bleeding of the gingival mucosa, which can control the symptoms of vomiting yellow water. You should pay attention to eat more fresh fruits and vegetables, because they contain a lot of vitamin C, which can increase the elasticity of blood vessels and reduce the phenomenon of bleeding. It is important not to eat spicy and irritating food, which can easily cause the oral mucosa to rupture and bleeding after the fire. Because of the serious pregnancy reaction in early pregnancy, if you use toothpaste to brush your teeth after stimulation, it will lead to nausea, vomiting phenomenon, you should try to use less irritating toothpaste to brush your teeth.