No LH surge?

Saira
I've been TTC for a few months, and I've always received a clear positive OPK for LH surge around CD20 or 21 (my cycles usually are around 33 days). I'm at CD22 and no clear LH surge yet, although the line is present at varying degrees (it was most prominent around CD18, but still present this morning). Also no EWCM, which I always get on the day of positive OPK.
Is it possible I'm not ovulating this month? Not sure what it means where you've had clear positives in the past, but now only faint lines.