Which Ovulation test looks the darkest?

Alyssa
Hi ladies. Just wanted an opinion as to which Ovulation looks the darkest ? There CD 11, 12, 13 & 14. However I'm also still in my fertile window so  it's possible I may have no reached it yet. I have no idea why it's so long. 
I had a miscarriage 6 weeks ago so this is my first month trying to conceive after my first period. According to another app I use they determined I already hit ovulation with 3 days of having higher temperatures then I usually do. Opinions ??? Thanks !! 

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