I agree with Tracey and Cassie. I think two weeks after giving birth is awfully quick to be jumping into something that could have huge effects on a body that's already going through so much. A doctor would have a better idea of whether it's ok or not, but your body is still healing and it needs nutrients to be able to do so.
I'm not a good example, since I managed to gain 30 lbs after having my baby and am only now, 2 1/2 years later, back to the weight I was after I gave birth, but I personally would suggest you don't do anything drastic so soon after having a baby. There's already so much physically, hormonally, and emotionally going on. Nobody expects you to be one of these Hollywood stars that's back to normal 5 minutes after having a baby. Least of all, I suspect, your husband.
Start: Feb 1/12 - 203lbs
Currently: 173.5 lbs
mini goal: 168 lbs
final goal: 140lbs