Hi Tom, thank you for sharing your story, I will do my best to answer your questions. 1. A test at 3-4 weeks is not conclusive, this is too early to test with the BioSURE HIV self test due to our test solely looking for antibodies to the virus. 2. The accuracy of our test never changes however a negative test can only be relied on 12 weeks post exposure due to the nature of individuals immune systems (a positive test can always be relied on). At 4 weeks 50% of people would have produced antibodies to HIV, therefore generating a positive line, at 6 weeks this increases to 95% of people and at 12 weeks this is 99.9% of people. 3. The symptoms you are describing could be due to many things. If your symptoms were a cause of seroconversion (due to HIV) then you would receive a positive test result because this is when your body produces antibodies. I hope this helps and I look forward to helping you further. Kindest regards Francesca Bard, BioSure (UK) Ltd"