First day of missed period and bfn

Chandra

So, I *always* spot several days before AF arrives. According to Glow, today is the first day of my missed period (this month I was on holiday and don't know the exact day I ovulated! 🤦🏻‍♀️) Anyway, no spotting and supposedly today AF shd've arrived, but a BFN when I tested this AM....thoughts?