BBT help

Haley
I am new to this and hardly understand it. Everywhere I read it says different things about ovulation. You ovulate when the temp dips, you ovulate when the temp dips and stays high three days in a row. Can someone tell me when I ovulated? Also, since my cycles are only 25 days (Glow says I should start on the 20th), when should I test? Today the temp is a little lower then previous temps, does that mean I'm not pregnant? 
UPDATE 7/12:
Fertility Friend has not helped. 

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