Light pink/light brown spotting

Just went to the washroom and I saw that I had light pink/light brown spotting on my panty liner .. is this the start of my period? I usually start my period off with brown spotting so seeing pink mixed in is kinda weird to me. I’m on the progesterone only pill, and I take it everyday, (as in as soon as my alarm goes off) so do not say it could be implantation bleeding.