I just did the same thing the other day. I was using a cable needle, so I figured it'd be really easy to start back again after a break. But I somehow managed to start knitting on the wrong side. The worst part is, I didn't realize it until I had knitted 5 rows (the bottom was curling up). A co-worker said it would make a cute design to leave it, but being the obsessive person that I am...I frogged it. The best part is, the end result was perfect! And definitely worth re-knitting.
"The way to love anything is to realize that it might be lost." -G.K. Chesterton