What a co-winky-dink! (sorry guys, couldn't spell the real word...) My kitten Misty has been having diarrhea for the past couple days too, only hers has blood in it...again. (I've had past history with this problem! It's the problem that brought me to this forum!) Anyways, I'm bringing a stool sample to the vet today so they can check it out and see what's going on this time. (Last time it was cocciddia) I recommend taking a stool sample to your vet. Stool Checks are cheap, only about $10-$15.
Just scoop a piece of his/her freshest stool into a zip-lock baggy and take it in and ask them to check it. Hope everything's OK!