OPK Help for a Newbie

I'm new at this and would love your thoughts/tips... I went off BC and started testing with OPKs on the following CD4...tested daily (sometimes multiple times a day) through CD23 and BD several times the week following CD4. The darkest results I got are shown in the picture. I'm still waiting for AF (only BFN so far) and wondering if I should have kept testing past CD23 since my darkest results don't seem definite. I know the first cycle after BC can be a bit off. Any tips are appreciated!