BBT drop before period

So I'm on day 29 of an expected 31 day cycle. This is my first month of tracking bbt and have heard that temperatures stay elevated if pregnancy has happened, and temperature drop before Aunt Flo arrives. 
I had a drop today, it's still above cover line, but does my chart look like I'm out for this month? 
Please leave a comment if you are experienced with charting 

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