plan b and then sex?

So my daughter came home and I found a levonelle plan b tablet leaflet in her bag, I asked her immediately to make sure everything was OK, not to pry on her!!! She told me she ran out of contraception pills and then had sex but her boyfriend peed before hand (doesn't make a difference, I know!!) and then went to tell me she had sex with him AGAIN an hour after she took the plan b pill. He didn't cum inside of her either times, but even though she had sex none the less an hour after, is it still okay? I am so angry at myself for this.