Hello I am a 28 year old straight male who had an unprotected sexual encounter with a woman I didn't know that well around December 13th 2009. I got tested for Chlymedia, Ghonnerea, HIV and Syphilis in early February 2010 like the 1st week of February at a nearby Planned Parenthood. I tested negative for eveything, then around mid April 2010, 2nd week of April, I retested again for all four STD's at my school's Health Center and again everything came back negative. It's now June 2010 and on the 9th of this month I went back to Planned parenthood and retested for all four STD's once more. I tested negative for HIV, Chymedia and Ghonnerea, but the doctor said something about me being negative for Syphilis but that something about a very low protein related to Syphilis was detected. She told me to walk away believing that I'm negative but to go back in 30 days for a rescreening. So I'm confused do I have syphilis or not? I will most definitly go back for another test. I have not had another sexual encounter since the December 12th 2009 encounter. Wouldn't the syphilis test I took in mid April had been a long enough window period to detect the antibodies for syphilies. If not should I also be worried about the HIV window period too, The one in mid April was about 3 1/2 months and the one in June was about 5 1/2 months closer to 6 months actually. I don't have any symptoms and I spoke with the woman I had the encounter with and she said she was clean and gets tested every 4 months. I'm just really worried and confused now. Especially about the HIV test. Oh the doctor said something about diseases like Lupus can cause this confusion, but to my knowledge I don't have Lupus.