Mawgatron - can I suggest you ignore the numbers and don't look at scales until your new baby is at least 3 weeks old? It's really not the stage of pregnancy where you should be worrying about it, this is when you should just enjoy the freedom of having a relaxed attitude to your body.
Come July time, then look at the scales and think if you need to start thinking about your diet/exercise, but as i've just said on another thread be very very careful about exercising post partum, you're high risk of hurting yourself - you could see if you can track down a personal trainer who's had specific training in post-partum training, you d'ont want anyone who's going to suggest you do anything that your body can't cope with.
I'm debating buying a jogging buggy/mountain buggy for once htis one's 6 months old, so I can drop DS at pre-school then go for a run/long walk - not sure if I will though...
Another thing that I took from the Gina Ford (I know, boo hiss) is scheduling food and drink for you as well as the baby! A lot of new mothers forget to eat properly (as I did!) then once your blood sugar crashes you stuff yourself with all hte cake and crap that people bring round when you've had a new baby. The idea of making yourself a proper breakfast or lunch gets forgotten and quick stuff gets stuffed in.
My tip (that I realised far far too late!) is to make sure you have snack food that's relatively healthy - so buy pre-prepared carrot sticks and hummus when you need something quick, have lots of fruit in you can snack on. I did read on here some time ago for someone who's DH when he made himself a packed lunch each day for the first month back to work made her a sandwich too and popped it in the fridge, so when you just can't think about making something, there's something other than a chocolate bar.
If you're bfing esp, drink lots regularly, you can get dehydrated and then that can be linked to craving sugar. So basically, even if you don't do routine for baby, do routine for yourself. 