OPK positive?? Did I miss it on the tests?

Courtney
Ladies I would love your opinions!! Today is CD14...I've been taking OPK's since CD12. Yesterday's was close & today's looks lighter. Could it be that I peaked yesterday afternoon & just missed it on the tests??? 
From my experience after I get my + OPK the next day mine get lighter (which to me makes since...but I could be wrong)  
Any opinions would be great! Thanks