Ok..uhh..where to begin..Well for starters, you didn't put nearly enough in for a preview. It's easy to tell a girl got bit by a vampire, bit her back, and her cat helped. But why? It would have been better (to me, at least) if you had added in a bit more. Two or three more pages probably would have been enough. Next..the art. I'm a crappy artist, and I've no right to judge anyone on their art, but that doesn't change the fact that the art for your comic is..unrefined, I suppose. It's just..amateurish. I'm all for keeping it going, but try to make the art a bit better. How? I dunno..
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Do you like frogs? Piss me off and you'll be living with them.
Correct me if I'm wrong, but from the information that I know beforehand...if you exchange blood with a vampire for three days (I think?) then you also become one of the undead. Is that what you're getting at, here?
I think you should put some details in the background. As well, your folds need a bit of work. I'd also advise you to study human anatomy a bit more. It seems like an interesting storyline, though ^^ I'd like to see more.