Plz help

okay so me and my boyfriend had sex (protected) but he did put it in without protection for literally only a little bit, he didn’t ejaculate in me or anything. But my period is 2 days late, which it’s not a big deal but i’m not feeling any “before period” symptoms, like my boobs so hurt at all. i’m kind of scared, and don’t know what to do or can anyone suggest maybe another reason for late periods? it was a day before my ovulation period was supposed to start