A month ago, I had protected oral and vaginal sex with a CSW. The thing is that before the intercourse, she rubbed her vagina against my scrotum/penis base for about 20 seconds. I know this is very low risk for syphilis from reading other questions, but mostly that's in developed countries. I'm in a third world country, where syphilis is an epidemic, and this was a "low end" CSW. I asked her if she had STD screenings recently, and she told me that about a week before, but I obviously don't believe her. I'm going to have blood test at 6 weeks, but anxiety is driving me crazy and I'm looking for some peace of mind.