Negative CB Digi at 14DPO/CD28

Nina • 29, TTC baby #1, madly in love
Soooo sad and scared it will never happen.  I have a very regular 27-28 day cycle.  Cramps, but not as much as when AF is coming (have had them on/off for past 4 days in my back) with sore boobs.  Took a test with the litte bit of urine I had this morning -- admittedly, it was not my FMU as I had to run out and get  the tests.
​This BFN feels so painful.  Should I even still hold out hope???