Implantation bleeding signs? Timeframe?

I went to the bathroom at work and when I wiped it was a pink color. Very strange to me. Possibly implantation bleeding? Is it within the right time frame? AF isn't due until NEXT Thursday. I'm slightly crampy. Maybe a 1/10 on the scale. Good sign? I usually never cramp or spot before AF. :) ah! BRB while I try to calm down.