If you're that paranoid, maybe you're in the wrong hobby.
That said, if you use a cover for 100% of the encounter, there is zero chance of you contracting something. Even less of a chance if you get a handy with a cover. It's a waste of money on covers honestly.
I cannot sing the praises enough for the free clinic in the Hill District.
https://www.alleghenycounty.us/Servi...-Clinic-HIVSTD
They're no bullshit, no judgment and [mostly] anonymous in that, you don't have to provide your PCP info, but you do need an ID.