AF due 10/7--one day late--BFN

Emily
Hello everyone,
AF was due for me on 10/7. I tested on 10/5 and 10/8 (today) both BFN. I had my mirena taken out in June and I've been incredibly regular since then. 
Is it possible I'm pregnant even with a BFN after a missed period? 
Any suggestions on what to do?