Has anyone ever been pregnant but gotten a negative PT urine result?

Ariella
I have been almost 2 weeks late for my period, and have cramping, bloating, some nausea in the morning and breast tenderness for a few weeks now. My at home pregnancy tests (sorry don't know the abbreviation!) keep coming back negative... But I still haven't gotten my period and still have all the symptoms... Going to doctor today to figure everything out, but wanted to know if this ever happens!