work....

okay so I'm a little over 33 weeks pregnant now. is it normal that work should be getting to me as badly as it is? I'm a server and I work 7 hour shifts with no break at a fast paced restaurant. I don't serve upstairs anymore and at first that helped but now I just feel so tired and worn out. Sore. my leg hurts so badly within a couple hours that I can hardly stand to put pressure on it. when I get home my body is so sore that I don't want to move or do anything. should I think about not working soon? or should I tough it out and work all the way up until my due date? any suggestions?