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Thanks for writing, Corleen.  What is the name of the Clearblue product you're using - is it the Clearblue Fertility Monitor or Clearblue Advanced Digital Ovulation Tests?

The Clearblue Advanced Digital Ovulation Test

Hi Corleen!  When using this test, Peak Fertility (a solid smiley) is designed to remain on the screen for 48 hours as a reminder that this is your most fertile time.  Once you see Peak Fertility, stop testing and have intercourse at any time within the next 48 hours to maximize your chances of getting pregnant.  It's not necessary to continue testing once you've seen Peak Fertility, and trying to test while a result remains on the screen can result in an error symbol.  The screen will clear itself after 2 days, and your digital holder and any remaining test sticks can be saved for use in a future cycle.