don't panic meegm - I have had a couple of c/s too and I get a bit of pain in one area interior (doesn't match with my exterior scar thus I assume itis the interior scar). It usually relates to times of major internal stretching so in addition to what Lil-Aussie said it is more likely to be these kind of things happening rather than implantation in the scar tissue. If it does get beyond a little ache go see someone but remember too that the location of early pregnancy aches for other can cooralate with the scar area of those who have had previous c/sections cause thats just where all the activity in early pregnancy is anyway.

Hope it doesn't give you too much grief for much longer.