Period sex and plan B

I need some peace of mind if possible. My boyfriend and had unprotected on my period. He planned on pulling out but his game was a little weak. We realized we should be safe and take a plan B even though the app telling me the likelihood of me getting pregnant on my period that day was 1%. Took plan B within a 2 hours. But we are still a little freaked out. Especially when we saw Plan B has a weight limit 🤦🏼‍♀️ ( yes I know this was stupid and not smart. We understand. Condoms are usually used religiously.)