Quoting Asia marie:" Theres no way right? Im only 10w4d. I got my butt on a scale yesterday. Middle of day to see my heaviest ... [snip!] ... button like they used to. Theres no way it can be baby. I mean its only 2 inches... Any ideas? A weightless food baby??? lol"
Your uterus expands and causes the belly. I know when I was pregnant with my first I started having issues getting into my pants around 10 weeks (they were really tight) and I was in the same boat. My midwife said that some women's uteruses just expand faster than others.