Give yourself till 6 weeks before you panic that you've lost only 7lbs. After an emcs you have a lot of excess water and air, plus uterus still shrinking, fat supplies for bfing etc. A lot self rights in the first 6 weeks.
I put on lots of weight when pg, despite being active. I had ds 8 months ago by emcs and I am not only back to my normal size, I'm smaller with a flat, toned stomach.
I started walking pretty soon post emcs, slowly at first, then more briskly, then a trot and finally by 8 weeks I was exercising again, jogging and doing some dvds. I also lug ds everywhere in a sling. He lives in it.
After my first emcs I ate far too much crap and was v inactive but this time round I've drunk plenty (bfing can make you thirsty and you mistake it for hunger) and always had lots of healthy snacks available at all times. DH left lunch in the fridge so that I wasn't starving, stuck bfing and only able to snack on rubbish.
I've lost 3.5 stones, no dieting, just healthy eating and being active.