Question about plan b

My fiancé and I got a little carried away the other day and he came inside me. We went straight to the store and I took plan b within 30 minutes of it happening. A little later that night, we had sex again and the condom broke (we have shit luck). He wants me to take another pill. I'm scared it'll be dangerous for me. Should I take another pill? Or will that one I took protect me for both since they happened within hours of each other.