If he is truly undetected being on ARV drugs the risk is minimal.
However, you had unprotected anal sex with an HIV positive person, it will be essential for you to test at 4 weeks with a Duo for your own safety. If you wish to get a 100% conclusive you will have to retest at 6 weeks. A 4 weeks duo changing ahead is very unlikely.
Good luck.
Oral no worries. Anal no risk for HIV if he is truly undetectable and less of a risk for the top if he isn’t
Depends, was itoral or anal?