However, if it extends well into the second trimester, if you are unable to hold food down at all or if you are losing weight, you should be evaluated. There are some rare complications of pregnancy which may cause severe nausea and vomiting. Despite the fact that intermittent vomiting is a problem for the mother, most babies do well if you can hold down fluids and easily digestible foods. During your prenatal visit, you should be checked for ketones in the urine. Some women must be hospitalized for a few days for IV fluid administration to get their electrolytes back to normal.
Some medications can help as well.
Folate deficiency has been implicated in extreme nausea. Be sure you are getting at least one milligram of folic acid per day. If you are taking a prenatal vitamin supplement, this has folic acid in it, but could also be contributing to the nausea. The iron in vitamin supplements also could be a problem. It is better to take the folic acid separately until the nausea subsides.