First time using plan b? Help!

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So me and my boyfriend have decided to try having sex using only plan b as our form of birth control.

I’ve bought a box and plan on using next time we’re intimate, but I’ve never used it before and the thought of misusing it makes me nervous.

We usually go at least 5 or 6 rounds whenever we’re together, and on the box it says take up to 24 hours after unprotected sex. Should I take it immediately after our first round and it’ll cancel out every other time?

Or wait until it’s all done to take it.

Someone help break it down to me exactly what I should do? Please?