A bit over a week ago, I made the decision to sleep with a prostitute. I had unprotected oral and protected vaginal, did not come (not that it is relevant). About 6 days later I noticed a red rash on my scrotum area, not particularly bumpy but it is red (slightly itchy) and looks shriveled like a grape. I have no pain while urinating. The rash has spread under my penis, and my penis area is sensitive.
At this point, I have convinced myself I have herpes, though it is too early for any formal testing.
I am in an (otherwise) monogamous relationship (with my only other ever sexual partner) and I have informed about the 'rash', so am not having sex for the time being, but will not be able to put it off much longer. I do not want to run the risk of passing along an STD, but at the same time, do not want to tell her of the incident.
At this point, how should I proceed. What is my chance of having the Herpes virus and what would you do in my situation?
Thanks.
-Ashamed