Hi dr., had dry sex with condom and undergarments on (both of us). took 'event based prep' 4 hrs before act. the sexworker had touched the innerside of condom by mistake before the act (serious?) completed prep course in next two days. hiv risk?

Probably not: Using a condom (even if touched by the sex worker) and taking a full course of PrEP and PEP reduces your risk markedly. But, cannot give 100% assurance that HIV was not transmitted, just that the likelihood is very low. Only way to tell for sure (especially if your going to be seeing a sex worker periodically) is to get a 4th generation HIV assay in 2 weeks and 3 months