OPK fail?

Mads

So I have been tracking my ovulation using Clear Blue Advanced Digital OPK and I had negative ovulations yesterday and the day before (the blank circle) and then this morning I forgot to test. I came home from work and tested and while waiting for the test notice a lot of egg white CM. Then the test came up with a solid smiley. So there was no flashing smiley at all! Has anyone else had this!?