Girlfriend and I had unprotected sex for about five seconds. What are the chances she could've gotten pregnant from my precum (if there even was any)? I put a condom on after and ejaculated into that about 20 minutes later. She is a tiny bit worried about the precum (we don't think there was any but hard to be sure) getting her pregnant, and is debating if it's worth it to go take Plan B and mess with her cycle or if she'll be fine. She's 20 and her period ended about two days ago.