OPK Failure

Has anyone used Clear Blue Advanced Digital and never received a Peak symbol, but continued to have sex every other day and got a BFP
I have had 10 days of flashing smileys and no peak. Although, I had what I thought to be my ovulation cramping. I'm confused and nervous if I didn't ovulate or if these damn tests are inaccurate at determinating the LH surge. 
Help! 

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