Hmmm...if you've done what I think you've done, it's very likely that it could get infected if it isn't already. I don't know about any treat yourself things that might help you, but generally tcp type stuff, can't remember the name but it comes in a spray that is blue at the top and pink at the bottom (or the other way around...) think it might be savlon? Whatever it is, it'll sting like hell...just try and keep it clean, as helenia has said.
But since it'd obviously be pretty rubbish to get a horrible infection where you've cut yourself, maybe you ought to think about going to the doctor's? It's not like you were doing something really weird, after all. Though all I can imagine he/she might do would be to give you some antibiotics, but maybe I'll be proved wrong. It never does any harm to see your doctor, even if you do feel a bit silly or like you might be wasting their time on an insignificant problem, at least it'll put your mind at rest.