ok so im not too sure whats going with my body. i still havent had my AF and my back is hurting a…

ok so im not too sure whats going with my body. i still havent had my AF and my back is hurting a lot more than usual when im at work and when my bladder is even some what full it hurts right there where the top of my jeans are. i cant wear anything too tight because that makes it hurt too. could i be pregnant or is there something else going on.... im two weeks late on my period