Breeding?

So I(18M) and my boyfriend (21M) both have a breeding kink, I'm ftm and he's currently on a medication that boosts his fertility and I'm also on the pill.

I want him to breed me, we've used plan b before, but that's been when the condom has broke. His sex drive has been in overdrive, we'll fuck and then like a minute later he'll be hard again, I wanna do something one of these days and just let him breed me as much as he can but I'm worried the plan B might not work if we do it a bunch in one night