How can you tell if you are HIV negative?

To be sure, test your blood at a clinic. It's possible that a blood test results in a false positive, so you might consider retesting your blood. A blood test usually takes 3 days to perform, so just try to remain calm and keep your mind off of it until you get your results.

Clarification note: Any positive result from an initial HIV test should be routinely confirmed with a second type of test that is more sensitive to HIV. This confirmatory test should usually be run by the same laboratory or testing centre where you had you first positive result. You should not do this yourself by just going for a second HIV test - the type of tests are different.