Now this might have been better to ask prior to sanding but...

I have a 1974 Fuji Special Tourer that I picked up at an auction for $8. Nothing special, needs a ton of work, but I wanted to learn more about the mechanics and such, so I thought it would be a fun little project. Anyway, would this bike be likely to have lead paint on it? I've already sanded it, and of course, didn't wear a mask, made a huge mess in the garage/drive, and all that fun stuff, so little I can do now even if it did, but curiosity (and maybe paranoia) is getting the best of me?

Also, I know taking it somewhere to have it stripped would have been wiser, but I wanted to do it all myself. Call me stubborn, or maybe stupid.