I always thought that cd 1 was the first day you started bleeding.  For the past several months I've had one day of spotting, usually only enough for a liner, maybe then the next day I would be bleeding heavier like normal then so forth until the end. I would always count my cd 1 on the day that I was truly bleeding and needing protection. This time AF was late and I had brown blood only when I wiped after using the bathroom. And then two days of light bleeding, like just a liner light.  I've been having normal period bleeding (if not heavier) for the past three days.  I think today would be day 6 if I count when I first noticed blood or day 4 from when I started bleeding a lot. Help??