I had really dark brown spoting at 7,8 & again 9 weeks. It was definitely old blood & my DR said nothing to worry about. Im 35 weeks now & my baby boy is just fine. If you feel it's more then that go with your gut & get it checked out. Good luck
I would call ur dr./midwife and ask. I know it happened to some women but it could also be leading to miscarrige.