Lost virginity and period is late by 4 weeks???

I was suppose to get my period June 1st and it still hasn't come. My boyfriend and I had sex June 6th. It wasn't much but he only went in a few times because I couldn't bare it, he respected that and stopped. We didn't use a condom cause we weren't expecting that to happen I was that scared or stressed that I was pregnant because it was just precum and we stopped. Also I am on birth control but I'm not afraid of being pregnant please inform me on anything please tell me your thoughts. Thank you.