I know, it is soo hard to believe when it finally does happen but you have to believe me, I have been ttc on and off since 2003 and I have only EVER had ANY line (however faint) when I have had a baby in me. The tests do not activate that 2nd line unless the pregnancy hormone is detected. It is only faint because its early, the further on you go the more HCG you get in your body, the darker the tests will get! I put a post in 1st Trimester with 14 tests that I took over 14 days and how they get darker every day.
CONGRATS I am sooooooo happy for you xxxxx