So I'm just being really paranoid?
Yup, pretty much. It's good to be concerned, but you need not fret over simple words. If you're really freaking out about it, clear your browsing history and cache before you close your browser every time. (If you don't know how, tell me what browser you use, and I'll explain it.)

As long as you're not looking at actual pedo porn and you're not in possession of it, you're golden. Chillax, bub.