late BFP - how late was your BFP?

Piper
This is for those who did not get a BFP until after they missed AF. I have heard some women will not test positive until 2-3 weeks after a missed AF and some that never tested positive on a hpt
I am 9 days late and I'm NEVER late I have a very regular cycles. So I find this very odd but have taken a few tests and keep getting BFN's. I contacted my doctor and she told me to keep testing twice a week for the next 3 weeks! THREE WEEKS? If I'm pregnant I'll be 7 weeks by then. So frustrating! 
Added pic of test from 8 days late. I need some insight! Help! 

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