I am 28 weeks also and halfway through the day my back is killing me and my pelvic area is so sore I can barely move. I feel ya girl!
Just hit 29 weeks. The past two weeks I've "felt" pregnant. Hard to get out of a chair, car, couch, etc. My belly is definitely there! I think what you're feeling is pretty normal.
I'm 28 as well and the biggest prob I have is my back aching. I do believe we are supposed to be constipated as well as have swollen ligaments. my growing belly is taking a toll on my mentally, sometimes I think to myself "where did this come from?". lol im sure we will feel better soon enough.