Line? Or reason?

So a couple days ago I thought I started my period because I was spotting, only once when I wiped was there little blood spots. I put a panty liner on and nothing more for the next two days. My period is due today, took a test and this seems negative, but then with my mind I see a faint ass line. I know I should wait and have to wait anyway to take another or if my period comes first. But is it common to have spotting two days before a missed period? What does this look like to you?