Late period??

So ke and my boyfriend finally had sex and we did it a few times actually but since then my period hasnt shown up and is 5 days late. He did put it in without a condom on unexpectedly but I just took it out and kade him put one on. Losing my virginity hurt since it's more stretching than Im used to and so I wasnt able to go long enough for him to finish at any point. Is there maybe another explanation for why my period is late?