First calm down, 2mm is nothing. I suggest you screw the pocket template back on, just move it back to where it just shows the mistake. Go easy on the router, think what direction it wants you to move it and route a slightly longer pocket. Again; 2mm is NOTHING. Nothing you can't fix. You'll 'have to' move everything else (pups and bridge) back a couple mms too. If you can't because the pup cavities have been routed and bridge has been drilled, check how much travel the bridge saddles allow. I don't think this is a huge problem. You'll make it work. Just take it easy and sleep on it.