In the middle of the night, my pup (9 weeks) vomited a bit. No food in it or anything, it was clear like water. She went right back to sleep afterwards. I can't think of anything that would trigger it, but it worried me a tad bit. Should I be concerned, or could she have been just feeling a bit bad or maybe kinda hot? Perhaps I should bring it up to the vet when she gets her second set of shots, or do you all think I should call today?