Has anyone has to wait til a week after their missed period for a positive?

My friend was telling me that she got negatives with all 3 of her pregnancies up until a week after her missed period. Was wondering if anyone else was like that as well? I've been having a lot of symptoms and no period(mine is usually clockwork was due sept 29 and still no bleeding) but all my tests have been negative. So I was wondering how likely it would be to get A positive if I waited a few more days. Thanks for your time :)

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