So confused

First time actually trying to use opk's regularly. I'm so confused though because on August 18, CD 6 I tested and in the time frame the opk was negative. Now when I look at it it looks positive. Does that mean I ovulated or do I disregard the test? As you can see in the picture the test line started faintly and then was faint but darkened after the test time. The third is faintly there and now today's is starting to darken. I am so confused, I've never really used opk's like that. Can one of you lovely ladies help me out?