what the hell do i do

i had sex last night, condom broke and some def got in me. I’m 2 weeks late on my period BUT i know i’m not pregnant cause last night was the first time i had sex since like march and i had periods in between then and now, and my periods are usually very irregular. I took plan b this morning but i’m still nervous. It says my fertile window begins tomorrow so idk. If i already began ovulation then the plan b won’t work. i’m 17 and FREAKING OUT