He said he would pull out and didn’t

The guy I’ve been dating and I slept together last night, we’ve spoken about me getting on birth control, but have been using the pullout method successfully. Last night during sex I heard him say “F*** it” under his breath and he came inside of me. He said it’s no big deal, just go get the Plan B pill. I’m ovulating right now so it will not work.

What would you say to him if you were in my shoes?