Cycle Day 50!

Miranda
What the hell!! 
I am on cycle day 50! F I F T Y!!!
I generally run a 35 day cycle but I am now over 2 weeks late. 
Two hpt with negative results. Neither FMU. 
Blood Work done CD41 - also negative. 
I don't understand & it is frustrating because it is hindering my ability to try & conceive. 
Any thoughts on what to do, it is starting to become very upsetting for me. 
TIA