Hi Stacey,
Didn't wanna read and run but i'm a few weeks behind you so don't know if my experience counts for you. I've had all sorts of dull aches / twinges etc off and on since the start. I too think it's tummy stretching and stuff moving, which must be getting even more rapid at your stage. Like Zoe said though, A&E or EPU should help you out if you are concerned.
Keep us posted.
M X