The OPK detects a surge in LH (Luteinizing Hormone) which means when you see that Smiley Face ovulation will occur in the next 24 to 36 hours so it's time to "get busy", or i should say "more busy" . But the Smiley Face for me means much more than that. It means hope. It means my body is functioning properly (this month at least) and it's doing its job.
The last couple of months have been a bust, i'm not even sure that there was an ovulation last month but i get another chance this month to have a go at our dream of being a family of 3 :)