3 weeks Late BFN -- No symptoms -- No AF

Cortney
Oye! Thursday will OFFICALLY be three weeks late! Let's talk about stress! My DH and I have been TTC for 4 months now with no luck. I have a 34 day cycle never being more than a day late. I have no signs of AF either. hoping that tomorrow's blood test will shed some light. 
Any other long cycle / late BFPers out there?