OPKs wrong?

Hey guys,

I’m currently CD 21 and still haven’t gotten a positive opk. It’s typical for me to ovulate a little later but I’m confused because I had lots of egg white CM, and low OPKs. Egg white Cm is not normal for me unless I’m in my fertile window of course. My OPKs never got above .32. But now the egg white cm is gone and the OPKs are lighter. I was testing 3 times a day so I don’t think it’s very likely I missed my “surge” of LH. Is it possible the tests are wrong? Have you had the same issue with OPKs?