I'm sure the weight will come off if you just stick to eating good clean primal foods. I totally get where you are coming from with counting calories - it's something I do not want to do either as it just takes over your life IME.
Also something I forgot to add is I wouldn't go to low carb when BFing, I'm not sure on the science, but I know Breast milk has high lactose content - so baby gets nice and chubby, that sugar has got to come from somewhere, and I would think you will need plenty of primal carbs to make it.
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................