Hello Valkyrie, first off let me say that your test at 5 weeks is your true status assuming its a combination test. NO TEST can detect HIV infection 3 days from exposure conclusive. RNA PCR tests have a high sensitivity closer to 1-2 weeks but even then those results are not conclusive. I understand any faint positive mark would cause some distress but simply put; the biologics, mechanics and sensitivity of these tests cannot pick up a recent infection of 3 days. Since you're referring to a reactive line I'll assume its a rapid test which is conclusive around 6 weeks.
The guidelines are in place to ensure you get tested ACCURATELY at the proper times.
3-6 weeks combination (p24+antibody) test
1-2 weeks PCR for early detection - must be f/o by a combination/rapid test
6wk - 3mo rapid test as standalone
Please fill in those gaps as to which tests were performed when.
Wishing you excellent health,
C.M.