Any nurses here??

I’m an ER nurse who works 12hr shifts. I’m 32 weeks currently with my first and this past week have been struggling. I’ve been getting serious abdominal pain and back pain that will start about 5hrs into my shift and is like that until I lay down. I actually called in sick on the weekend and went to OB to be checked out. It’s just growing pain basically but I’m not sure how I’m supposed to do this for another month. I bought a belly support band but it’s not doing much. I’m not sure what to do.