8 days late, all BFNs


So...I'm currently 8 days late. My last period was 9 days long. I have taken 3 ERPs (1 early result, 1 rapid result, 1 digital...all came up negative except the digital, got a ? mark). I've even taken a test from work (I work at a hospital) and a whopping negative. Has anyone experienced this? BTW, I am NOT trying to get pregnant. This is the hospital test: