I actually did get a negative at the doctor's office when we were ttc with my dd. I had a faint positive on a home test and went to the dr's to confirm and they told me no! I demanded a blood test, got one, and it was positive. I had dreamed that I was pregnant and was SO sure. I kept reading that a faint positive is a positive and sure enough, it was! On a side note the nurse was really snarky with me about how "these things are like 99% accurate... try again next month..." I wanted to call her and say HAH!!