Pregnancy scare

I’m still in school and I had unprotected sex with my boyfriend Monday but he didn’t bust in me and I took plan b Wednesday but found out that it didn’t work cause I had sex during my fertile week and now I’m scared I’m pregnant and it’s only been a week since sex but I don’t get my period till the 21st and I’m stressing myself so much and can’t wait till then because I’m scared and idk what to do any help or ideas😣