Implantation bleeding?

Ok, so hang with me for a minute. This is my month thus far. I haven't had any spotting or anything...until today. My CM has been slightly egg whitey but not a whole lot since my fertile week is over. Today when I looked in my undies I saw cm with a tiny bit of brown blood mixed in. None when I wiped. Is it too soon to be implantation, maybe it's just left over from af? Am I just over thinking this? This is the first time I have ever spotted.