One Partner Undetectable, One on Prep, HIV Risk?

[MascTop]

I don’t know if I’m being overly paranoid, but I will explain what happened. So about a two weeks ago, I topped a guy I recently started hooking up with. I’m positive/undetectable for over 10 years. Last VL test was last month, undetectable. The guy who bottomed for me is on Prep and has been for months. 
 

I topped him two nights in a row. About 10 days later, he came down with a mild fever for two days and felt better after. That freaked me out. I know ANYTHING can cause a fever but the timeline is what is spooking me. 
 

Given that I am fully undetectable and he is on prep… are there any odds that I could have infected him? If anyone can share any insight, I would so appreciate it. 

[Slut4anyload]

Chance is zero if you really are undetectable, whether or not he is actually on PrEP.