I use the clearblue advanced digital OPK's. I had a flashing smiley for 4 days and then got my solid smiley on Monday meaning I should've ovulated by now. I've had sore boobs and been slightly crampy. I haven't had these symptoms for a while because I haven't ovulated in several months. I've yet to have a rise in my BBT though. Is it still possible I ovulated?? I'm really hoping so. This is getting really frustrating.