very light spotting 4 days before AF

Megan
Very very light spotting this morning when I went to bathroom. I'm 4 days away from AF. I put a tampon in thinking AF showed her face 4 days early and I got super down about it thinking I was out again this month. But I went to take tamping out and nothing! Not a single speck of blood. Could this be implantation bleeding 4 days away from AF??