Hi all, started using the clearblue advanced ovulation tests and on day 5 of the flashing smiley ( started flashing on CD7) the test line on the stick is practically disappeared now though. I know we're not to look at the lines on these but curiosity gets to me. Does anybody know the science behind how these lines work . I have read somewhere that the test line dissapearsor fades before you hit the LH peak is this true .