My "bump" didn't really start showing till 13 weeks and even then it seemed only I could see it! But the last 4 weeks I seem to have grown nicely and have a noticeable, if small bump.
I sometimes think I'd like to be bigger but that's never going to happen, my mum carried small, and I carried small with Lucy so I'll have to live with the fact I'll be small again!
All in all I think its a good thing, I'm quite small anyway (5'1) and if I had a big bump it wouldn't be good for me.
Its hard though, especially as my SIL is pregnant and is 2 weeks ahead of me and is much bigger. I know I won't be the only one drawing comparisons!