HIV test accuracy? scared after many years?

Update: 4 years ago in 2014 I had one time unprotected vaginal sex and 3 and a half years later in 2017 i did a 4th generation Ag/Ab combo test which was thankfully negative, as of today it has been 8 months since i did the test. My worry is that could i already be in the "aids" stage?!!! and therefore the test... show more 4 years ago in 2014 I had one time unprotected vaginal sex and 3 and a half years later in 2017 i did a 4th generation Ag/Ab combo test which was thankfully negative, as of today it has been 8 months since i did the test. My worry is that could i already be in the "aids" stage?!!! and therefore the test not work and the antibodies not show up since then the body would not produce any antibodies?. Also, would anything cause the antibodies to disappear by now? such as autoimmune disease?

Thanks
3 answers 3