Does anyone else have a "hard belly"?

Hollie • Currently expecting my rainbow baby😍
I am unsure as to how far along I am, because I've always had irregular periods, but I'm guessing around 7w1d. (My first appointment is Wednesday) 
I'm curious to know when everyone else's bellies started to get hard? The sides and top of my belly are as hard as a rock and my belly is actually starting to shape! My family believes I'm farther along than I think, because with my first pregnancy it took a while before my belly hardened. Anyone else's bellies get hard really early?!