22F & scared I might get pregnant

Hey all, so I have an IUD and had unprotected sex last night and he came in me. I didn’t realize I was ovulating until my period came unexpectedly today (it came late which is semi normal for me). Wtf should I do? I’m nervous I’m gonna get pregnant and I’m not even exclusive or dating this guy so that freaks me out more. Recommendations and help is welcome please