6 days late & a negative?

Hi ladies! Today I am 6 days late and I tested with FMU and I got a BFN. I have never been late on my period other than my first pregnancy which ended in MC. I keep looking and looking hoping to see that line and I just don’t get it. My periods have always been regular. And when I wiped there still was no blood. There’s no sign of AF. Anyone experience this?