I'm pregnant. this morning i drank coffee for the first time since i found out, now i have diarrhea, vomiting, and i'm nauseas. what could this be?

A few ideas: I'm so sorry you're going through this. It's possible that the caffeine caused this, but also possible that you have a stomach gastroenteritis and the caffeine just happened to have been drank at the same time. Regardless, sounds like you need to hydrate as best possible. The stomach and intestines are a lot more sensitive in pregnancy, so it could be that this is your body's reaction to the caff.