Contractions or Baby Movements..39 weeks?

This isn't the first time I have felt this feeling, but I got to thinking that maybe it's more than what I thought it was. For what I have thought was baby movements, could it be contractions?The feeling is tight in my upper stomach (the top of my uterus), and it makes it hard to breathe. I figured it was my baby's body curling up in a ball while pushing on my ribs. The feeling puts pressure on my lower stomach. It isnt really painful, but it is very uncomfortable and very tight (at the top)..I have had cramps before, which I thought was a contraction, but now that I am feeling this too, makes me wonder what is what. Baby or not?..