Am I pregnant?

So on the 14th I had sex for the first time the day I was supposed to get my period. It was un protected and he pulled out a while be for he came. It is currently the 23 and I still didnt get my period yet and he says that sometimes sex can push back your day to get your period but I'm scared bc I really dont wanna be pregnant and idk what to do. It's only been a week and a day. So can someone please give me a piece of mind.PLEASE