My advice: If you decide to, make sure you get the clearblue regular, NOT the advanced. The regular is a simple smiley face/no smiley. Easy peasy. The advanced does "you should receive two days of flashing smiley to show high fertility, and then a solid smiley once you've reached your peak". Buuut.. sometimes you skip the flashing smiley and go straight to the solid? Sometimes you stay with flashing and never get the solid? It just adds more confusion to the table, IMO