OPK help please.

Tristyn • Happily married. Mommy of 2💙💜
Hey ladies, this is my first time taking opk's. I know that the test line is suppose to be as dark as the other. This is what I have so far with the tests. I have been TTC for over a year now. I'm wondering if the line is suppose to get darker with each day or if it just varies. I'm sorry if this is a dumb question. Thank you in advance! 

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