As our members have pointe out to you, you are conclusively negative for HIV. Testing in the time frame you did negative means that you do not have HIV and all symptoms you suffer are unrelated. Please see your doctor to help you with that. We are now closing this discussion.
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If you tested negative at 4 months on an HIV antibody test, you are negative. You have conclusively tested negative. All symptoms are unrelated.
So, what you are saying is that you tried IV drugs for the first time and are unsure about the needle you used? Well, unfortunately, we aren't going to know if it was new or not either. I would say that if you are truly unsure, you should test at the appropriate time. You can get an accurate result at 28 days with a 4th generation DUO test. The other users of a needle that is shared would have to be HIV positive for it to happen and that's probably not the case. So, keep that in mind. But if you might have shared a used syringe to inject drugs, you will have to test.
You still haven't clearly explained your supposed exposure. Until you provide that key information, the volunteers here won't be able to help you. Exactly what did you do that makes you think you were exposed to HIV?
What was your exposure?
ANY HIV test is conclusive when taken 90 days (or more) after the event, so you do not have HIV since your test at 3 and a half months was negative. It is conclusive.