Hi, I too am due to start any day now. I have been having the light brown blood only when I wipe as well( though its not everytime). Seems more like a spot here and there. The only time I spot is the day before I start AF and its usually pink the first day. I think that this may be implantation too because I have been cramping for the past few days and even pains in my ovaries since ovulation. Are you having any other symptoms hun? How about your cramps? Mine seem to come but don't last long like AF ones and they aren't as strong. Maybe you can test when AF is due just to make sure, never know you may get that BFP!
Welcome to this board, there are alot of great ladies here that can answer any questions that you may have. Hope that I might have helped a bit.