I waited until after 6 weeks the second time as well. My midwife told me that after your second & subesequent caesareans you need to be even more careful. She said that you might feel better sooner, but it takes longer for everything to heal up the second (or third, fourth etc) time.
That's really interesting. I suppose with scar tissue from a first c/s, it would delay the healing on a second one maybe?