While some vomiting is ok too much may be a sign of a condition called hyper emesis gravidarum . Should this condition happen the mother could become dehydrated and of course the mother and child are at risk.Close observation of the patients urine and blood work if the vomiting becomes excessive or if the woman can not keep anything down is important and sometimes hospitalization with IV fluids is required but this is only in severe cases.Some doctors think that pregnancy actually causes a type of cholecystitis or inflammation of the gallbladder and this is what causes the vomiting. Now in the mean time alot of doctors suggest what is called a dry diet.You do not drink when you eat.So any fluids have to be taken separate from solid foods.At least 1/2 hour to an hour after solid foods.This might do the trick.Also taking foods in VERY small quantity at very frequent intervals.Then separately drinking your fluids later.The fluids are very important also of course.Also some woman find that certain foods such as those high in carbohydrates like pasta stay down better than other..Hope this helps