Aches and pains are (hate to say it) a part of every pregnancy, and they can certainly get worse as it wears on. Baby is growing like a weed (watermelon?) now, and taking up just about every bit of available room in your abdomen. That giant uterus shifts your center of gravity and stretches out and weakens your abdominal muscles, which affects posture and puts a strain on your back. The hormonal changes of pregnancy can make things even worse. See, those hormones are prepping for baby’s big exit, working to loosen up the joints and ligaments that attach the pelvic bones to the spine. This can make you feel unstable and cause a good deal of discomfort. Pain is never fun, but hey — at least that means baby will be here soon! And once you're trying to push baby out, you'll be glad for every last bit of loosening up.