Can anyone help explain my chart?

Nicole • Married June 2014, and TTC our first! :)
I'm confused as to what I should be getting out of my chart.  My temps continued to lower for a few days after O, does that mean I didn't O? I got pos opk on cd16. Does my chart look normal or is there anything I should be concerned about? Just still new to the charting and would appreciate some feedback! This is my second month charting. 

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