Stressing out

So my bf and I had sex for the first time last week and we made sure to use a condom. Since I wanted to be extra safe, I told him to still pull out, but he didn’t. I understand that since it’s our first time, he prob couldn’t control it that well. I’m usually on time with my schedule but I’m 6 days late and I’m kinda stressing out about it. I heard that sleep, stress and even sex can delay periods but I’m so scared. I don’t know what to do and I’m really stressed out. Any help??

Update: I just got my period the next day and I am so happy. So now I know that sex does change hormones and can delay periods and stressing out about it doesn’t help!