My 3 year girl woke up sick with vomiting and now have black diarrhea. should i take her to the dr r just watch her?

BLACK DIARRHEA: Dark stools are usually due to iron intake not melena at this age. Depends on the severity of the sx or if not sure, see md.

Definitely.: Black stools could indicate the presence of bleeding in the gastrointestinal tract and should be evaluated. This can sometimes be painless and relatively free from other symptoms beyond inducing diarrhea - since blood acts to increase the rate of motility of the gut. There are also certain medicines and supplements that can cause dark or black stools (iron supplements, pepto-bismal type meds, etc.

I would!: Black stools can be a sign of bleeding somewhere in the GI track. Luckily, the test for blood in the stool is a quick and easy test that can be done in your pediatrician's office. I would have her checked out there first.