Late period. Help!!

I was supposed to have my period around the 3rd. Once in a while it’s a few days late but it’s never been this long and I don’t know what to do or how to feel. There was one incident with my boyfriend and I about a week before my period due date. We never use condoms or any form of birth control other than the pull out method, and we were a little late on the ball. I haven’t been experiencing any sort of symptoms of PMS or anything. What should I do?? Starting to get nervous...