I have read this topic for quite some time. I have used ClearPlan this week and on Wed morning the two lines seem the same colour but the colour of the left line fades in 20 minutes. I did nothing that day and checked again that night and the next morning, the left line rarely appear! Is it I have missed the ovulation date? Can any experienced Mom advise whether the left line appear the same colour and darkness as the right line = ovulation will occur in 24 - 36 hours eventhough the colour of the left line fades away like my case.