Could I be pregnant?

My period was due on Thursday 6/12 so as of today I am 4 days late. The only sign I have is sore and tender boobs. I am not spotting, but I have a clear/egg white discharge that is sticky and stretchy when I wipe which I don't usually get before my period...SORRY TMI :(... Could this be signs that I am pregnant? Anyone have similar signs? We have been TTC #1 for a few months now.. Since I went off my birth control in December I have still been fairly regular with 28-29 day cycles...