Hey hun,
How far did you walk then and what does your mw class as over doing things. I would personally just listen to my body and go with my own instincts.
Try not to feel disappointed because you've had a c section, it was out of your hands and the most important thing to remember is that you have a beautiful healthy baby. Next time around you might get the birth you wanted and experience a natural birth. I don't feel anyway that I missed out on having natural birth, everything happens for a reason.
They do prefer not to exercise or start dieting till after your 6 weeks postnatal check that's with normal or c sections birth but a gentle walk is normally ok and eating sensibly, maybe next time go for a short gentle walk with baby.
Every now and then your scar will hurt so take it easy when you can. I think it might good to take a few weeks out from dieting and just concentrate on being a new mum and enjoy Anderson while his tiny the time really does fly by, Hollie's a year tomorrow and its crazy how fast its gone
Hollie was about 7 weeks when I started dieting properly xx