How long should it take to get a solid smiley with the Clearblue advanced digital opk? I've had 5 days of flashing. I'm on day 18 of my cycle. Last month and the month before I used the other Clearblue OPK. The one that only tells you the day you're ovulating (only shows the solid smiley). Last month I never got a smiley so I guess I didn't ovulate. I'm concerned now that all I'm going to get is flashing and once again, not ovulate.