clear blue digital ovulation kits

Jodie
Hi All, 
After a bit of advise I have been testing with CB opk since last Sunday, Sunday was negative but since Monday I have been getting flashing faces including this morning I haven't yet had the static smiley which appears for two days. 
My period was late this cycle 30th Jan - 3rd Feb (4 days) usually 5 days but last month was only 3 due to a miscarriage in December. 
I'm confused how I could be ovulating so late and also for so long as it's now a week.
Has anyone experienced something similar to this, should we continue testing or assume it's over for this month? 
Thanks

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