I have had two minor "sticks" (more like scratches, like you) during my nursing career thus far, and i chose them well, as they both had hepatitis (B,C once and just C once)
In both instances, I was told by the employee health folks that the risk of converting from a superficial stick by a small bore needle (once it was actually just a blood sugar lancet, although that one went into my finger) is quite low. Naturally, though, I wasn't taking any chances. I did not take any HIV meds, but I did follow up with blood work for about 6 or 9 months each time. I had no problems, never converted to Hep+. Don't quote me on this, but at the time I did some research on conversion rates after a "dirty" needle stick and I believe that it's about 30-35% for Hepatitis, and that is based on a significant stick, whereas I don't think that your risk would be even that high. HIV has a much, much lower infection rate after a stick. I'd say don't panic, but I worried each time I had blood drawn until I heard that everything was ok. I know people that don't follow up on "insignificant" scratches/ sticks by needles, and they are all but one just fine... there is the one, though, that has hepatitis and has no idea when she even got it, as she had multiple needle sticks in her past that could have caused it, but she never followed up. Point being, you are probably just fine, but you are doing the right thing by making 100% sure.