What usually happens in this situation is that the test isn’t able to completely separate HSV 1 from HSV 2, even though the test is type specific – sometimes it just dribbles over a bit, that’s the only way I know how to describe it.
If you happen to have gotten infected at the one encounter that you had, then yes, the antivirals could interfere with the results, but that is so very unlikely. If you are concerned about that, then you will need to wait about 3 more months. How long was the time from your one time sexual encounter to the time you began taking suppression?
Terri