Most on here would tell you that what you experienced was a very low risk exposure. If you go to a facility for the PEP, they'll likely tell you that it's not necessary in your situation. I've read that HIV among CSW is quite low, around 1%, and even lower in those that don't have drug problems and share needles. Stats say that only 1 in 2000 or so sex acts with a positive person results in contraction of the virus. Add to the fact that your exposure was so brief and your odds are quite good. I myself and waiting for the 4 week mark for a conclusive test, but I've learned a lot by searching this site. Try and relax. I worried myself sick, literally, by stressing over my exposure. The truth is that HIV is more difficult to contract than most think. One shouldn't have unprotected sex, especially with a CSW, but there are well documented situations where a spouse has HIV for years without knowing and their partner remained uninfected. I would take a mulitpanel test at 4 weeks to be sure, but your chances look very good.