Getting up in the morning and throwing up yellow water in pregnancy is a sign of pregnancy reaction that occurs in most women in the early stages of pregnancy. In the morning, since the stomach is empty and there is no food, the yellow water vomited includes a small amount of bile. If the yellow water appears and you are able to eat normally, the effect is not significant. If the vomiting is more severe and continues after eating, it may be severe pregnancy vomiting. If the vomiting is severe and continues after eating, it may be severe pregnancy vomiting, which needs to be treated with fluids at the hospital because vomiting can cause water-electrolyte disorders and dehydration, which can have serious effects on the fetus and the mother.