Oh girl, I looked 4 or 5 months pregnant for a good month after my C-sections. Breastfeeding only helps with the contraction of the uterus, not so much with weight loss (in fact, I held on to an extra 10 pounds until I quit nursing). The only reason you are bigger than before is because you just had a baby, that's all. not because you're fat or unhealthy or unfit anything else. Yes, there are some women who are a size 4 before pregnancy and a size 4 again within a month after delivery. We're not all made that way. Your muscles and skin will gradually shrink back down over the next several weeks/months. Not only were they supporting a baby, but they've been injured because of the surgery. You have two things to recover from! Your body needs a break! If you exercised regularly before and/or during your pregnancy, check with your OB about when you can resume that kind of activity. It's probably not for 6 or 8 weeks, or until you quit bleeding.
If it helps put it in persepective, here's my experience:
I don't remember exactly after my first C-section (4 1/2 years ago), but I recall a big drop in weight around 6 months, then again at 9 months, then I was back into my pre-baby jeans at 11 months (marked that one on my calendar...). Remember that your body was loaded with all those pregnancy hormones that cause cartilage and ligaments to expand. Even when you are back to pre-baby weight, your body might still be bigger/wider in certain parts (hips, feet, shoulders) because of this -- that's what happened to me. I was within 5 pounds of pre-baby weight at 6 months, so should have been able to fit into my jeans, but couldn't. The hips didn't come back together until 11 months.
After my second C-section (2 years ago) I knew that I'd still be in maternity clothes for a few weeks. After a month I got fed up and decided I needed something decent to wear, so I went shopping. Much to my surprize I had to buy size 14 pants (that fit tight!). I'm normally a size 6 petite. However, in a month I was in size 12 (yes, I went shopping every 3 or 4 weeks for a new pair of capris that I wore over and over!), then a 10 a few weeks after that... I was within 10 pounds of my pre-baby weight, and at least down to a size 8 by the time my second child was a year old. He was 15 months when I woke up with a backache and realized my pants fit loose -- my hips shifted back together (causing back muscles to ache) and I was a size 6 again!
Hope this helps.
And hope you're enjoying that little girl!