🚨🚨 Pregnancy scare, help! 🚨🚨

On Tuesday and Thursday I (19F) had unprotected sex for 1-2 minutes (literally) with my boyfriend (21M) out of curiosity. According to my app, my period was due in 2 days. He did not ejaculate in me; he did not ejaculate at all. On Thursday I drank a plan B. And now According to my app my period is late for 4 days. (My period is Always late for 2 days). I’m very worried. I have my period symptoms —> carb cravings, pimples and tender boobs, but no period. I’m scared, please help me. 😭