“Date rape drugs”

So my boyfriend and I have been fighting a lot recently. (He just moved to Colorado for a job I stayed back home to finish school) well I got a call from him this morning, he was bawling. Saying how last week he went to a party, and he thinks his drink was spiked and he was raped while unconscious because he just got a call from a girl that was at the party saying she just got bloodwork done and found out she’s pregnant and he was the last person she slept with. First off, he never told me he went to a party, secondly if the party was litterally 5-6 days ago, can she already know from a blood test if she’s pregnant? And he says he got a confession from her that while he was wasted she did take advantage of him, and he says he doesn’t blame me if I break up with him. He says he feels disgusted with himself and can’t even look at himself in the mirror after that traumatic incident. What do I do? Most importantly what do y’all think about the situation? Please I would love y’all thoughts and opinions.