need to re-test?
I’m am a male and had unprotected insertive fellatio from a commercial sex worker of unknown status. I got tested on 16, 21,28 & 41 days post exposure. Test was 4th generation using CMIA technology. ALL results are negative. Should I take it as as conclusive or need to re-test? Also, 3rd generation tests are easily available in my locality – plz suggest it accuracy and window period.