Thanks for the replies. Didn't think I'd have wound too far on it, as it was a roll of 36, and isn't there generally an extra exposure or two? I tried to be careful not to apply too much pressure once I got up to the end of the roll (at least what I assumed was the end of the roll, but not if I didn't load properly).
That being said, I can't even open the back to check the film or its current state. The rewind knob doesn't budge trying to pull it up to pop open the back. I know there's the lever...I've moved it back and forth multiple times trying to make sure it's in place. But the knob won't budge. ??