4 days late still bfn

Has anyone had this happen? I am super regular to the point that 6 weeks to the day after delivering my son last year I got my first period. My OBGYN didn't belive me but I did. The most I have ever been late is 1-2 days or I was pregnant. I feel like I'm going crazy. I feel pregnant like heaviness in my stomach but still getting bfns. I have had some slight cramping but that's it. Oh and I have a lot of watery cm, almost feels like I peed myself. Anyone had this happen? If so, how did it end for you? Thanks!