Most tests aren't accurate after a couple hours. The accurate results are shown after 3 minutes.
all 7 of mine did the same thing. its probably because your really early, the best thing to do is take one more and if it comes back positive then go see a doctor.
Take another test or go to doctor to test, the line ahouldnt of went away. Ive never heard of that. Just test again, test tho in the morning,