I only used OPK's this cycle, but here is my experience with them, The first two days I used them, no line at all just the control, then next day there was a line, not faint but not darker then the control which would also be a neg, then the fourth day I got a line that was def darker then the control and that was my positive, then I took one last night (5 DPO b/c I always feel the need to pee on something LOL)and that had a very faint line which was a neg, but it was there.........soooo if that wasn't confusing right?!?!

So I am not really sure if you missed your window or not??Did you BD in the time that you were seeing something on the OPK's? I am all so new to this, I only charted CM b4, I do hope that you caught that eggie

Good Luck!!!