I'd go with adding a life line also. You might be missing a yarn over, which I wouldn't recommend fixing from those few stitches.
Knittinghelp has a video for adding a lifeline under Basic Techniques-->
miscellaneous-->under Fixing Mistakes (last video). (the site currently not cooperating with me enough to get to that page myself)
Can I ask why I shouldn't try to fix it? Because there wouldn't be enough yarn?
So I guess frogging is the only solution?