I Recently 3 Months Ago Gave Oral To A Guy

I recently 3 months ago gave oral to a guy who said he was almost positive he didnt have HIV it only lasted for a few seconds and there was no ejacultion I don't think there was much precum my mouth is healthy save for my wisdom teeth coming in and I bite my gums from time to time. I asked around and I think I am fine but should I be worried at all