Anonymous wrote:You'll get a solid smiley on your 'peak fertility' day, and it will stay on the screen for 48 hours.
Yes, this is correct. Once you get the peak/solid smiley...stop testing for the remainder of the cycle. The smile is locked for 48 hours. If you test after that, the unit assumes you have started a new cycle/month. The solid smiley means you are at peak fertility. Ideally, you should time sex the day before, the day of, and the day after you get the solid smiley. If you can only hit one of these days, go for the day you get the solid smiley, as soon as possible after getting it.