Which day do you think I ovulated based in my OPK tests?

Which day do you think I ovulated based in my OPK tests?

Originally I thought I got my positive on august 12 since it looked positive but now looking back the test I took on august 13 was darker. Because the one on august 13 was darker would that be more true of a positive OPK?

So I thought O day was august 13 but do you think it could have been august 14??

AUGUST 12

AUGUST 13