I eat a tablespoon or two or peanut butter periodically myself with no ill effects, I don't think that little pb is going to make a dent in your diet no matter where you stand and what your goals are. Like many here I am also a fan of pb.
What I will say is avoid reduced-fat or low-fat pb. a) It's more processed and therefore less natural no matter what the label says and b) per bottle they use fewer peanuts (check the label: it's probably reduced/low-protein too!
) and compensate with more sugar/starch/gums. So it's actually probably worse for you than plain ol' reg'lar peanut butter.