Ways to avoid a pregnancy after unprotected sex

Last night I had unprotected sex when I was drunk. The guy pulled out but I am still afraid/worried that he wasn’t fast enough. The semen was everywhere too. Anyways my question is, is there anything I can do to try and prevent a pregnancy, honestly just to be safe. I’m only 17 and still have a year and a half of high school and not ready for a baby.