I think I might be pregnant??

Okay sooo my boyfriend & I have sex often ish (with condoms) and we've only had sex without a condom maybe 4 times but 3 or so of the times was foreverrrrr ago that we did and he pulled out as soon as he felt himself about to cum of course and finished on a rag.. Lol anyway, we had sex Sunday night without a rubber because he didn't have one on him at the time (of course he pulled out before he finished inside of me) but I was supposed to start my period Wednesday & didn't and I still haven't....