I truly can't remember how long after my c-sect I stopped feeling uncomfortable or having no pain down there....
It could be scar tissue pulling, so perhaps really gentle massage with lots of cream may help break down the scar tissue. I am no expert & I just had a hard push on & around my scar & I have no pain (BTW DD is 4 now) / discomfort.
Perhaps consider getting an u/s to see what, if anything is going on in there.