AF is MIA.. I'm so confused! 😩

Belle • Is this real life?
Alright guys,  my period is 3 weeks late as of today..  
My last period started on January 23rd 
I'm on cycle day 49 of a typical 28 day cycle.  
I am just so confused!  I've taken a few tests all bfn. Most recently a digital last week that was negative. 
I have had mildly sore breasts since a few days before my missed period. And have had frequent headaches but nothing else out of the norm.
I don't have any major stressors and I don't have any diet changes or known health issues that might cause an irregular cycle. 
When I first missed my AF I really believed I was pregnant but after all these negatives I don't know what to think. At this point I just want answers!!
Anyone have any advice/kind words? Experienced this before?  Anyone else in the same boat?Â