Missed the surge?

I’ve been testing twice to three times a day to track my ovulation and never got a positive. My Eggwhite CM has come & gone. My OPK got close to positive but instead of getting darker, it got very close to positive and then got lighter again. This is the first month I’m using OPKs, is this normal, did I miss the positive OPK, or maybe I didn’t actually ovulate this month?