Help!!

So last night I had sex with my fuck buddy.. When he was about to cum he pulled out. Then he wiped off his penis and put it back inside of me. According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> my fertile window ended a few days ago.. I'm not on birth control either.. Should I get plan b? 🙈