When should I take a pregnancy test?

Faye • 26 • Erin - 20|08|15 - 9lbs • Bonnie - 19|08|18
So as fertilisation can happen between 6-12 days do I start counting from the beginning of my fertile week or do I count from the day I got a positive opk to figure out the earliest I can test?
The beginning of my fertile week was 17th Nov and I got a positive opk on  21st Nov. 
I know it is best to wait until a missed AF but I'm too impatient haha. Also just wondering when all of you ladies count from becuase I don't have a clue. 

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