A bit more than 3 years ago a condom broke while having sex with a prostitute (I am male, she was female). She noticed that it broke, stopped, and we changed it. The unprotected sex did not last longer than a few secs, but the tip of my penis was exposed. I am circumcised. Lately I remembered the incident and can't stop thinking and freaking out about it.
What is my risk for HIV transmission in this episode?