How reliable are clear blue digital ovulation?

Am

Just wondered if anyone knew how reliable these kits are for predicting ovulation? I had 6 days of flashing smilies followed by a static smiley on cd13. My last 4 cycles have all been 25 days long. I expected my AF to turn up on Wednesday. I’m on cd28 today with no sign of AF at the moment although I have cramped all week (it could well be lurking). The cramping has stopped now and my pregnancy tests are negative. I’m just wondering whether it was possible I ovulated even later despite having a static smiley on cd13? I’m planning on temping next month just to understand my cycles a bit better.

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