My SiL looked bigger than I am now when she was 3 months. I am "small", "neat", or "not six months pregnant", depending on who you ask. But I'm a good 8-9" taller than SiL... so I refuse to be envious that she looked pregnant and everyone adores her!

If you're short it could well be that you're just being evil and looking pregnant early, whereas us bigger girls have to wait ages for a proper bump.