On April 12th I had unprotected penetrative vaginal sex with a female as a male, about 2 weeks later I had flu and paranoia and delusions set in. I went to a clinic in Switzerland where I was on holiday, they did a blood test, it was negative, and said the possibility was low given the circumstances of one interaction, male/female sex, and the female s background. This was on the 2nd May, I m planning to get tested again on the 7th May, so I assume it will be a negative result also and furthermore on July 12th when I do the recommended 3 month postexposure test? Since I experienced no symptoms or anything of that nature, do I have reason to worry? Thanks in advance.