can someone help a girl out

Tam
I hope and I do pray to GOD that he has blessed me I'm on a 35 day cycle I was tracking by using OPK I started at CD15 I posted a few times and a lot of people said CD17 is the positive one but on CD19 I got two very dark lines the two bottom ones are CD17 and the top one is CD19 when do you think ovulation would of been CD17 or CD19