I have literally just got my BFP and was due my period on Sunday. I have been having brown spotting since Friday and still today.
Obviously I am only just classed as 4 weeks so can't go and see anyone, but I can't remember if this happened with my previous pregnancy.
It's not loads, just every so often when I wipe (sorry if TMI). I am also producing loads of CM so keep feeling as though AF has started but when I go to the bathroom it's just slightly brown tinged CM.