I'm 4 wks and I've just been to the loo and when I wiped, soz to be graphic, there was a very pale brown mark and a spot of red blood, I've got no pain just a very dull period like ache but I've had that on n off for 3 wks anyway, could this be implantation bleeding? I remember I had this with my son very early on, but its weorrying when it happens :(