Pregnant or period? We use protection every day

Hey everyone.

I am stressing out. I'm 21, and my periods are somewhat irregular. I can't remember for the life of me when my last period was. Just for the record, my boyfriend and I use a condom every single time we have sex, but I can remember a few times in the recent past that we had sex for about 1 minute with no condom, then he put it on. When I got worried about not remembering when my period is coming and it being possibly late, my boyfriend reassured me that if my period hadn't come in May that I would have noticed. He's right. However, now I'm waiting for my period to come, and it hasn't yet. I am bloated, spotted brown earlier today but now it's a light pink, and this afternoon I had this horrible episode where I had the worst cramps in the world right after I had sex with my boyfriend. Does it seem like I'm pregnant or my period's on its way? Any replies are greatly appreciated.