Those who've gained a fair amount of weight already, you could well find it slows down over the last few months. Last time I found I was eating a lot less towards the end as I physically couldn't manage to eat much as DD1 was busy squashing my stomach!
My body has changed since having a child, and it does take a while to get used to. After the birth I felt a bit like a train wreck for some time, it took me a good few months to get used to all the bits that were different. However, I've realised that I should be proud of my 'battle wounds' as they brought me DD, and also I've realised that a few things actually improved. :)
My breasts ended up bigger than before I became pregnant, my skin is a lot more stable and less prone to spot outbreaks, I'm fitter than before and my arms have never looked better. (Lots of exercise running around after and carrying a baby/toddler!) Meanwhile, in time, I've just gotten used to changes in more delicate areas. 
You could even consider some of the changes there as improvements as well.
Had my 20 week scan yesterday, all went fine. :) DD2 (as has now been 99.9% confirmed!) was being as much of a monkey as she's been at all her scans, but the sonographer managed to view everything eventually. By the measurements, looks like I'm having another long, skinny baby. I blame long, skinny DH. But then I can't really complain, as for giving birth it's better that than some of the alternatives!
Since the scan I've been feeling loads of movements. DD2 spent most of yesterday kicking me in protest at having been prodded repeatedly, then she's up early this morning having a good wiggle and kick. I wouldn't be surprised at this stage though if she goes quiet again for a day or two. I'll start tracking properly once I reach 24 weeks.