Does a stomach of pregnant women grow within 3months?

Sort of: Your uterus does grow, but it doesn't get to the top of your pelvis until about 12 weeks. I have never figured out why, but your stomach (at least in most women) gets bigger much faster. Clothes don't fit (while pregnancy clothes are still too big) & you look bloated. It is very common, with nearly every woman experiencing this. I assume it is hormone related, but don't know for sure.