Slowing down.

Each day, as the day goes on, I get a pain in my right butt/hip area that makes it harder and harder to walk. I take stairs very slowly--I just can't seem to go up them at a normal speed. And I've been getting increasingly out of breath. This is very frustrating, because usually I move around a lot during the day, and now I wear myself out doing normal things.my husband is out shoveling my car out of the snow, which is totally out of the question for me. And I can't even imagine how I'll manage dinner tonight. Anyone else experiencing something similar? FYI, I'm 5'6", was medium build before pregnancy, and have gained 25 pounds at 29 weeks--all belly . So there's definitely a lot of strain on my body, but I don't think beyond normal for this stage.