6 Days Late

I’m 6 days late for my period. Last month I was spotting off and on around the time my period was due. I took a test last month and it came back negative. I took another test this month when my period was one day late, it came back negative. I am very regular and I don’t use birth control. Nothing like this has happened to me before. Feel like if I test tomorrow I’m going to get a negative. Any advice ladies ?