ANY line is considered positive if seen before the time stipulated by the test manufacturer is up. The line is usually faint, and gets darker only as the pregnancy progresses or if you take a test at the right time (after you've missed your period for a good 5-7 days or so) and if you take it first thing in the morning (when it isn't too diluted). Why don;t you repeat the test a few days later, with the day's first urine sample? a blood test would also give you more conclusive results. But it does sound to me like you are pregnant. Yes, taking the shot late can cause a pregnancy. all the best!