Is it possible that I am pregnant?

About 2 weeks ago my boyfriend and I had unprotected sex but he "pulled-out" (We knew about the risks, so no need to comment on that). And for the last 6 days or so I have been having strange symptoms. Very gassy, bloating, nausea, pressure in my lower abdomin, burning sensation in my stomach (Kind of like im hungry all the time, but feeling full at the same time), frequent urination, tenderness in only one breast (which is weird). My period was due yesterday but hasn't started yet. Does this sound like the stirings of early pregnancy?