TTC opk late cycle help

Christina
Hello I am TTC and I have an a wedge cycle of 35 but my lags was 42 my AF was July 21 start date i don't know what to go by because every app tells me a dissent fertile week one says start august 6 and the other week after ? I started opk and having two lines not very dark but it's gettig there I'm so lost and stressed 

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