Smaller belly with pregnant waddle

When I was pregnant with my first, my belly was so big and round at six months but this little man is tucked in more. There's times when he comes out but for the most part he's hiding pretty good in there. It's definitely affecting how active I am and yesterday I overdid some organizing. Now I've got the pregnant waddle going on and some serious lower back pains. I'm going to take it easy from now but SO keeps making fun of the waddle with a smaller belly lol