I am sure I am. Really, if it's not your first baby, odds are good your uterus is going to be a bit bigger anyway. I've been in to see a HCP once since getting pregnant, at 11.5 weeks. And at that point, my uterus was "way up there" by my bellybutton. It's still about the same height now, but getting firmer and rounder.
I'm sure by 24 weeks it'll be just about right on, give or take a few centimeters.