Can the baby be affected at 18 weeks if you have the flu or are vomiting and have diarrhea?

You should call your doctor if you haven't been able to keep anything down for 24 hours.

This is nothing to worry about. A woman's body is AMAZING! It takes care of the baby before it takes care of you :) There are many women that have extreme morning sickness and their babies are just fine. However, if you are having symptoms that are more severe than regular flu symptoms or if you "just don't feel right", then do call your doctor.