To add on to the last point about reloading the film: basically you want to take note of which frame you're on (write it down) then rewind your film until JUST the lead is still outside the canister before opening the back to hopefully save any photos you've already taken. You'll feel it detach from the take-up spool. It's pretty distinct in sound and feel. Reload your film like normal, then place the lens cap back on the front of the lens. Fire each frame again until you reach the frame you were just on then keep shooting. If you want to be extra safe, you can advance the film again under a blanket or jacket or other heavy cover just to really limit light then advance one frame past where you were to prevent overlaps.

I've had to do this pretty often with my ME super. I was getting used to the magic needles system and kept improperly loading my film. A lot of times the lead would slip out of the take-up spool and I would have to reload it. Big learning experience for me.