Blinking Smiley

Hey All- I have been using these Clearblue digital tests for a year now and have never had this issue. I am on day 10 of a blinking smiley. I have tried my other test readers as well which all show me a blinking smiley. I started at my usual time and received a few days of empty circles and I really don't believe I missed my mark for ovulation. Has this ever happened to anyone? I am typically always a blinking smiley for 2-4 days at most before I get static smiley! My period is supposed to start in 4-6 days.