These tests are 95% accurate and if you think you may have contracted it 3 weeks ago from your symptoms, you did not as these are the wrong areas for a first time outbreak to occur.
If you had an affair 3 weeks ago none of your past tests would be relevant but what im saying is that the locations that your having issues are not the areas for a first time outbreak.
Several things: (1) Visual diagnoses are not completely reliable, I'm afraid. (2) The standard STD panel does NOT include HSV - you must ask for it specifically. (3) The blood test to ask for is the IgG type-specific test for HSV. However, the most accurate test is the Western Blot from the University of Washington - the gold standard and over 99% accurate, though more expensive. If you've been getting these tests done and they've been negative each time, you didn't have HSV at the time of each test. Hope that helps!