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BFP but days PG on app don't make sense

Cristina • Wed, Aug 19 • First baby born in April 2016 👶🏼 Expecting baby #2 June 2018 💙

My husband and I have been trying for three months. Last month was the first month I used an opk and tested my bbt. Yesterday after 15 DP0 I got my BFP!! I O on the 3rd and yesterday was the 18th. So I figured I'm 15 days pregnant, however the Glow nurture app said 3 weeks...how can that be?