OPK help- what do you think?

On Tuesday 7/28 I was feeling so crampy, nauseous, headache and had a tinge of blood when I wiped before bed. Is it possible it was due to ovulation and I missed my peak test late in the day 7/27? The tests seem to be getting much lighter now. I just took another which is not on this chart yet- first time ttc in a while so just looking for some insight