Breast feeding is not a sure fire way to lose weight it does not always happen that way.
everyone is different and lose weight at different times, you cant put an exact time frame on it

It can be hard and i know about the eating crap its so easy to do when you are a busy mum, take your time, walk with the pram, its good for you and bubs, eat well when you can,drink lots of water, just be easy on yourself it will happen it time.do not try and push yourself if you are not ready ifkwim xx