If your pain is radiating from a particular area every time ..that would worry me. I had placenta abruptio with my 2nd child (Placenta abruptio is separation of the placenta from the site of uterine implantation before delivery of the fetus) which resulted in a c-section. About a month before i was due i started spotting..that was my first clue. They put me on bed rest until he was ready. But my labor was very strange.. it didn't feel normal it felt like a sharp stinging pain on one side..no doubt the side it was tearing from. Tho it wasn't the most pleasant delivery, we did get him in time and now he's 6!
However, if it is just pains here there everywhere.. it could just be your typical body shifting pains. Heaven knows, that pregnancy..especially in your third trimester is SO NOT comfortable!! And lots of undue worry usually assists every pregnancy as well. (we just can't help it! ;) ) If anything, take it easy and try to get as much rest as you can. (hard with a 2 yr old, i know!)