How do you bring it up with someone new before kissing them?

I started seeing someone a few weeks ago and I have not had an outbreak since we met, but I know I carry the virus and I feel weird not saying anything. Part of me thinks most adults have it anyway and I am overthinking, the other part feels like hiding it is unfair to her. Did you tell your partner early on, and how did that conversation actually go? I keep rehearsing it in my head and it always sounds worse than it probably is.