Hi ladies! I need some help understanding how this cheap ovulation tests work. So far I had used clear blue digital, but thought I would give the Wondfo ones a try this cycle. I tested last night and this morning and I don't quite understand the result. The one last night is darker than the one this morning. I don't think I already ovulated because AF just finished 3 days ago and I normally ovulate around cycle day 15. Glow shows my fertile window starts this Sunday. Here is the picture: