Fourth gen tests at 3 and 5 weeks.
I had unprotected vaginal sex with a woman of unknown HIV status on Sept 30th. I started to get some mild symptoms just after 3 weeks (e.g. sore throat, slightly red face). I took a fourth generation antigen/antibody test at 3 weeks 4 days, and again at 5 weeks 2 days; both results were negative.
Could somebody please provide me some guidance on the accuracy of these results? As I understand it, if I were HIV+, a fourth generation test would detect either antigen or antibodies on one of these tests. I have, however, read that fourth gen tests can cause a second window period, where p24 antigen levels fall, just before antibodies are produced.
Obviously I plan to get tested again, now that it has been over 3 months, but would appreciate some reassurance.