Okay so I have two sons, ttc baby number three. With my sons, I tested only on the day of my missed period and the lines on the test came up instantly and very dark in both cases. This time around I've been testing for a few days and have gotten a few positives but they have been very faint. This morning is the day I was supposed to get AF and I took a test and I got two more positives but they are sooo faint and not at all like the tests I had with my boys. Should I be concerned??? Since the lines are so much lighter than with my sons on the same day of testing, should I be worried? Plus, the lines have been the same faint lines for days but they should be getting progressively darker with each new day right?