Spotting help pls!! is spotting a pre pregnancy sign

Day 4 of my “supposed period” started with a little light brown wiping and then a lil pink, but went away as day went by, then it was light pink, then a lot of pink when I wiped but pad was clean and today NOTHING, this never happened, so has this happened to anyone before? Can this be a pregnancy sign? is this a sign??? anyone experience this before