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Clearblue digital and first response OPK

Little • Sat, Sep 05 • Mother of 2 girls

Why is it I never got a surge on first response opk? Got a solid smiley face on cb digital opk. So I took also the first response I had and the test line is still lighter than the control line, the frer digital ovulation also said no. Is frer just not sensitive and can make you miss your O?