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ovulation/chart help

Edith • Wed, May 02

hi ladies, this is only my 2nd month tracking bbt. FF is saying that I ovulated on cd 18, but I had a positve opk on cd 15, and 16. cd 17 opk was dark but negative. I am a bit confused. what do you think? Also, how is my chart looking? I thought I was getting my period early since on 6dpo(yesterday) my temp went way below my coverline. any input is appreciated☺