Has anyone tried the Clear Blue Fertility Monitor? I have been using their "advanced" ovulation kit- the one with the blinking smiley face/solid smiley face. It is okay, but I am not sure if I should be spot checking to make sure that I don't ovulate later then when I actually get the solid smiley face (my BBT charting is not very good) If you have used the monitor- is it better then the OPKs?