My dog vomited, and before i knew i was kissing her head, and she might have had a little bit on her, should i be worried for myself getting sick?

Probably not: Usually shouldn't transfer same germs - esp if dog isn't sick (if it was only a vomit bc of eating a wrong thing). I would swish with LIsterine and brush my teeth really well! ;)

Why worry now?: Dogs vomit for all kinds of non-contagious reasons. Anyway, if you've been exposed to a dog pathogen, there's no certainty you caught it. Give it a few days, but there's really not much you can do at this point but worry needlessly. Wait and see--