pregnant or not?

I'm currently on day 47 of my cycle with no signs of it coming. 
Negative pregnancy test the last two weeks. 
Has anyone been almost 8 weeks pregnant without a positive pregnancy test? 
I have two kids but didn't find out until I was 15 weeks with one, and 12 weeks with the other. Currently I've been tracking my cycle for two years and so I know when I'm late. 
(I'm calling and getting a dr appointment today)