When you suspected your girlfriend was cheating, you set up a hidden alarm clock camera. It looks like they've been having risky unprotected sex for awhile :(
You were staring at your monitor, spraying bullets in Fornite, while he was staring at your wife's asshole, spraying loads inside her unprotected pussy.
It was easy to convince the shy girl desperate to get in the best sorority on campus to go unprotected. It was even easier to convince her "friend" to film it. When she starts showing later she'll lose her bid, wondering what went wrong.