PLAN B??!!!!

Soooooo me and my man have been having sex raw and every time he’s boutta cum... he pulls out.. ALWAYS. but tomorrow night we are planning for him NOT to pull out and use plan b right after? just because i’m curious to know what it feels like when he doesn’t pull out. what are y’all thoughts? should i go for it and use plan b? bc i have never used plan b or been on birth control and i was wondering if plan b actually works out.. HELP!!