implantation bleeding? too early?

So starting yesterday at 3-4 dpo I wiped and had red mucus discharge. Later in the day it had turned to a more pinkish brown color. Well today at 4-5 dpo I've been having light brown discharge when I wipe. Not every time just every other time. What could this be? And today if it makes since it's almost like my cervix is sore?! The picture is from late yesterday