Period or spotting

Reagan • Blessed with our first baby, Oliver David Dawson, on July 30, 2015!
At what point is it one or the other? I was supposed to start my period yesterday.. I had a bit of spotting Tuesday morning when I wiped but nothing the rest of the day. Yesterday, knowing that I would start, I wore a panty liner all day.. Had a little spotting again only when I wiped but nothing on the liner. I took a test Tuesday morning negative. This morning.. Medium spotting again... All red like AF.. Don't think it's IB.. But should I mark this as spotting or just a light AF? I feel like I don't even need a tampon.. Just a panty liner..