Thanks for writing.
The 4th generation HIV test covers HIV-1 and HIV-2. We do not see other subtypes of HIV, and we would consider a negative test at 12 weeks to be conclusive.
If you have had a negative HIV test at 12 weeks after a possible exposure we would say that you are negative, even if you are having symptoms.
The typical symptoms for HIV sero-conversion are very general, and can be caused by many different things (for ex: flu-like symptoms are most often caused by cold/flu, nausea can be caused by stress etc.). If you are having persistent symptoms we would recommend talking to a health care provider in person.
It’s common for people to worry after having a possible exposure to HIV. Check out our Worry and Anxiety page for some helpful ideas.
Please let us know if you need any additional information.