Ovulation Tests?

I got a positive ovulation test on the 7th but I was kind of iffy about it so I took another on the 8th which I felt was positive again... felt some cramping today so I took another & it's still dark... is that normal? I know the last one isn't as dark but that's because I just took it. the one I took before the top was clearly negative (not in the picture) 

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