OPK test readings -help pls xx

Angela • Baby girl born Sept 17 💕Preemie boy and girl DCDA twins born Dec 18 🇬🇧
I'm confused. My OPK test isn't showing a test line which is as dark or darker than the control line. Does this mean I have not ovulated? Test line today is lighter than 22&23  lines so kind of looks like I ovulated on 22/23 May. Thoughts please ladies. Help   
Baby dust to all xxx