Belly is hard at 33 weeks!!!!

I have gestational diabetes, my sugar level was pretty high after breakfast this morning (which is unusual considering i ate what i always eat in the morning).

But ever since I've been feeling nauseous, and my belly is hardening a lot, it happened before for a few seconds but right now it's almost constant and uncomfortable. I can't stand up or lay down because I am in class. I feel her move, still.

My next obgyn appointment is the 29th.

Is it normal?