Best ovulation tests??

Shelby • Married since October 2013!! Trying for baby number one:) wish me luck!
I've been testing after I recently started clomid. And I've used the 20 day "answer tests" from walmart and as the picture below shows most of them seem to be positive so I'm guessing some are wrong? I'm not sure, I'm just rlly confused. So I would rlly like to know from experienced user of ovulation predictors for the one they like best. Please! (Bottom one is most recent and top is latest) 

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