Light pink spotting? TMI

Hi ladies. I am kind of confused here, try and stay with me! I ended my period 4 days ago. The first or second day off my period I had no pink spotting at all just regular discharge...but then later that night I noticed some pink discharge in my undies. Now today I have more light pink spotting. Now there is no way possible that this is implantation already. What can this be? It can't be leftover blood because the one day I had regular discharge but then all the sudden light pink. Thanks in advance!