Pains?

I'm familiar with the overall discomfort of pregnancy by now- and compared to some pains ive had this is mild by comparison, however I'm growing concerned. It seems like more and more over the past few weeks, I can't even do simple things like get up to use the restroom without feeling like I've run some kind of marathon. I took the dog out and poured myself a glass of milk and by the time I made it back to bed my whole back was in immense pain and I just wanted to collapse and not move. Any suggestions? The only way I seem to feel better is if I just stay in bed- but then I feel lazy and honestly- I'm moving in like two weeks so I have to start packing so I can't just be in bed all the time.