Question to take plan b

Tonight me and my boyfriend had sex. We were using a new type of condom and I was on top of him when he came. After he pulled out he notice the condom was missing. Just straight up hanging out of me. I pulled it out and we both checked. No rips Just a small mess that landed on my vagina when I pulled it out. Now my boyfriend is freaking out. I told him I didn’t feel anything, no warm flooding feeling, no cum leaking out of me (even went pee after and checked for cum inside and nothing. But he still wants to get me plan B. I think I know my body and I should be okay. (I’m in the green zone and it says 15%) my period won’t come for other two and half weeks.