Hi there. Implantation bleeding can last longer than one or two days. Mine has been on and off lightly with brown spots and pinky blood for 5 days now. I started spotting 8 days after ovulation. My period is due in 3 days. It has also felt the whole time like my period is coming. I never get my period that early though. I have had 2 children before and they have been all different.  Good Luck to everyone!