Clearblue Advanced Digital Ovulation Test - False Positive?

Hello - this is my first time using the clearblue advanced digital ovulation test. I started on cycle day 7 every morning, I also used cheap ovulation tests for the afternoon.

I noticed the line getting darker in the afternoon over a period of a few days on the cheaper tests around cycle day 14. So I used the clearblue test in the afternoon after holding urine for 4hrs and restricting fluid intake. It came back with a solid smiley face, is this accurate? 

Thank you.