Spotting.

Hey yall. So I've been spotting the past few days now, and am trying to figure out if maybe its implantation bleeding or not. My last period was December 5th through the 9th. I was sexually active through my fertility window, and now I'm spotting when I'm supoose to be having a period. Like just a few drops here and there a day, theres absolutely NO FLOW. it's a pinkish color, maybe a very light brown sometimes, this isn't normal for me. I'm a HEAVY FLOWER on my period so I know for a fact it's not a period. Can someone help me? I need thought and answers