BBT chart help

Charlene • I`m from a small town, and me and my hubby got married march 2013. Hoping for a miracle:) <3
This is my chart recently. I am supposed to get my period tomorrow an my temps have been really high, I kind of want to test. Is my temps being higher lately just because if my in coming period or could t be a good sign? Not good at charting stuff so I don't quite understand it. 

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