I've heard and read and been told that you show sooner, and you feel the baby moving sooner in your second and subsequent pregnancies than in your first. As soon as I found out I was pregnant, I pretty much had to get maternity clothes. While my uterus isn't very big, all of the fat in my body has moved to my belly, and I have a nice little bump...of fat. Whatever, at least I look pregnant and not fat.
As for movement, I keep thinking I feel the baby moving, and then I realize it's just gas. And then I fart. Sigh.