Should I get a plan b?

My and my boyfriend we’re having sex and he came once and then he came after round 2 but then during round 3 he didn’t finish bc we had to leave fasttt so he pulled out and threw the condoms away. I peed once and then I just peed again and the tip of the condom came out but he didn’t cum that 3rd time! But he did previously and I’m on no form of birth control right now, should I get a plan b? Bc of precum and him cuming multiple times before?