How long did it take you to show positive?

My husband and I have been trying for a year now. I was on Depo for off and on 10 years, got off that in Jan 2014 and only took the pill until May 2014. I had 2 very early miscarriages late last year, but during both of those I had symptoms and tested faintly positive on EPT but then started exactly when I was supposed to. I was supposed to start this last Saturday July 25th but haven't yet. And I am like clockwork. I tested this morning with FMU and got a BFN. How far along were you before finally testing positive?