BBT after ovulation

💙Mia • Cajun & Proud, Conservative, wife to Royce 4.12.14 ❤️, mother to Bennett 8.12.15 💙
I've been taking my bbt for about a month now. I missed one day last week and one day this week, both because I didn't wake up at the right time. Last week I woke up 39 mins late and my temp shit up way high and yesterday I woke up 25 mins early and my temp shot down way low. 
I'm supposed to ovulate this week, and I'm concerned that maybe my temp shot down yesterday because I ovulated the day before, instead of it being because I woke up 25 mins early. 
How many days on avg does the bbt shoot down after ovulation? 

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