OPK question

* I know neither of these are positive* but I just took two tests with the same urine and got this

the top one I took first and the bottom I took a minute later and don’t know which is more accurate?

For reference, here are the rest of the ones I’ve taken recently (the bottom two are the ones in the pic above)

Could I be getting close to ovulation?? They keep starting to get dark and then getting lighter again..