Delayed period or something else?

I have an irregular menstruation and lately I have been extremely bloated. Last month, my period arrived on the thirteenth. My menstruation usually is late sometimes, but I am worried because I had PROTECTED ual twice, although the recent one would be far too early to solicit a pregnancy. I have not had any pregnancy symptoms, but I have had bloating and an acne breakout, which are usually tell-tale signs of my period. Is my period just delayed or could I pregnant?