If you get a faint line - chances are good that your pregnant.
I tested when I was one week late but got a negative. I was not trying to get pregnant.
I was feeling odd though, really sore boobs & feeling tired. And I was put off alcohol.
I tested again a week later (when I was 5 weeks) negative again. I even did a digital which said not pregnant but had two lines when I took the strip out. A week later again I tested agin and got a VERY faint line, and i was 6 WEEKS! The next few days and a few more tests with darker lines and a digital that clearly said PREGNANT - I was happy to finally have an answer. I must produce hCG very slowly. I can't believe the women that get a positive before their AF comes.