You are correct that at 6 weeks, there is 70% accuracy – that is, there is a 70% chance that your result will stay negative. I think that’s about as much as I can say about how accurate your testing is at this point. If, however, you do have it and it hasn’t shown up yet in the testing there is certainly a chance that you could be contagious, yes. And if you have new infection, you are quite contagious. The symptoms that you describe, however, are quite vague and not typically related to herpes.
The results are almost never ever 0.0. Your blood is always compared to a control sample and that is never zero either, so there is almost always going to be a value associated with the negative test. 0.19 is nice and low!
Terri