My shutter got stuck at 14 frames.i wound it back but want to go back to the 14th frame,will this ruin the pictures i have already taken?

SOURCE: Shutter stuck on Canon AE 1

Just now saw your problem.....I can repair this for you. No it's not "overwound" you possible have some small piece of plastic that caused your second curtain to get hung up and thus jam the entire camera. I have probably repaired 500 AE-1's with the same problem. Art www.flcamerarepair.com

SOURCE: My shutter release button is not working, instead

Your camera has a bad magnet in the body.
Repairs will cost more than probably what you paid for it; I'd suggest getting a replacement (I got a Canon AE-1 Program for $40 on craigslist, ebay has good prices)

SOURCE: Advance lever is stuck. I

Like all AE-1's and related models, your camera is gumming up inside as the internal lubricant films are at least 25 years old and are largely dried-out.

The fix is to get the camera to a repair specialist for a CLA service (Clean, Lubricate, Adjust). As a one-off extra cost also get the foam light seals and foam mirror buffer replaced as they'll either be absent by now or will still be turning to a sticky goo. Modern foam is is different material and is will not decay like the old stuff.

A CLA and foam replacement definitely costs more than the residual value of the camera, but they're solidly built and have plenty of cheap high quality lenses so can still achieve results which compare well to even the best modern pro dSLR's. Get the work done and your camera will probably last until 35mm film ceases to be available. Your camera will also withstand conditions which you'd never dare risk a dSLR in.