Positive OPK help!?

Terre • Married to my high school sweet heart. 8/3/13. ❤️TTC #1 since August.
According to Glow...today (CD16) is my first fertile day. However, I've been testing for a few days now and have these 3 tests. We BD on cd14 and will tonight as well. However now on CD16. My test line is wayy darker than the control line. What does this mean!? Help 

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