How many DPO

Violet • TTC babe # 2! 💃🏼
Ok so I've look everywhere online and cannot find a solidified answer. My opk said I had my PEAK day on January 19th. Does that mean I ovulated on the 20th or the 21st? How exactly are you supposed to know your exact ovulation date? I'm having issues determining how many DPO I am. Any ideas? I've heard 24-48 hours after your peak. So am I just supposed to guess how many DPO I am?! 

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