when should I test?

I ovulated 6days ago so would that make me 6dpo and when should I test again as Wednesday the 3rd of October I'll be 13dpo and then the 10th of October I'll be 20dpo if you can get 20 that is and the 11th obviously I'll be 21dpo as took a digital but it said not pregnant took it apart as I know it's invalid when you do that but there's two lines there and someone told me if it's digital the lines are already there before you pee on but not sure if that's true thanks for your help x

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