Hello,
Thank you very much for your post. I assume that this sexual encounter was over one year ago (and not March this year).
The fact that this encounter was with a sex worker does not necessarily mean that she was HIV positive. However if we assume that she was positive, the estimated risk for you from a single unprotected penetrative insertive vaginal intercourse would be less than 0.1% or less than 1 in 1,000. Therefore the risk is relatively low and I woudl think it is highly unlikely that you have become infected, although it is still possible to become infected from a single encounter. I think you need to move on and in order to get complete peace of mind, you ought to be tested. I am quite confident that the test result will be negative. The main lesson to learn from this is to always use condoms from now on.
Best wishes,
Dr José
Hi doctor, yes it was from last year. So far I'm ok! Regarding std I don't have any discharge or any symptoms. What are my risk for std?thanks