I agree with everyone take another test using first morning urine get the pink dye ones
Its hard to know what is going on - it could be a positive (very, very, faint) or a false negative as adgal said. Take a digital - no guess work in those.
In all honesty, I do not trust the blue dye tests. I have had tests that look positive, I would have sworn were positive, but were in fact negative. The best thing to do would be to retake the HPT using a very sensitive (as you are early) test, such as First Response. Use first morning urine, and perhaps even give it a few more days.
Sorry, I don'[t mean to be negative, I have just had it happen too many times with the blue dye to trust them. Good luck, I hope it is a positive!!