Hi Anxiety3 By 9 weeks after infection, about 97% of people would have created the antibodies that the BioSURE HIV Self Test looks for. So the chances of a negative result changing after this point are about 3%. So the negative results you have are very encouraging. The other issue to remember is the chances of contracting HIV from unprotected oral sex are low, even if the interaction was with an HIV positive partner, about 1 in 2,500 times. So the chances of your of your negative result becoming positive at 12 weeks is extremely low. I hope that this answers your question. Kind regards Gary Carpenter BioSure (UK) Limited