OPK help

Hey ladies! This is the first month I am tracking ovulation using a kit and I need help. The first picture is from March 26th, which was CD13 for me. The other picture is from this morning, which Glow predicted would be my most fertile day. I almost didn't test this morning since I hadn't been able to the past couple of days and I thought I had already ovulated. Now I'm not quite sure what to think. I was under the impression that a line that matched the control line meant you were ovulating, not that it had to be darker than the control line like the one I took today. My periods are slightly irregular too, which is part of why I have been testing every day this cycle. Any help interpreting results would be greatly appreciated!