I am 4 days late. I've been on birth control for a year now. I missed 4 days of my pills and I also took antibiotics this past month. I decided to take a pregnancy test.  I received my results within 45 seconds. The test was positive. The HCG line was light red. I waited for another 2 minutes and the HCG line faded away. Now my tests results appear negative. Do you think I tested too early and my HCG levels are too low ? Or is it really a negative result ?