I would still consult your gnea doc it can be a sign of low progestorone! Like earthangle said it is pretty normal aslong as its not bright red,clotting, back ache,stomach ache but i would defo consult your doc or GP just to be on the safe side,cant hurt can it and if your anything like me youll only worry if your mind isnt put at rest atleast they can monitor you!.
spotting normal am 9 weeks plus and am still spotting my doc said its ok as long as its not bright red