JordieC,
I would try not to worry. I had light bleeding with my first at around 9 weeks also, paniced went straight to the doc, had a u/s, confirmed nothing was wrong, no evidence of the placenta tearing etc. Then was asked the question how long it had been since we had sex, of course it was recently and the doc said that pressure on the cervix early on in preg can cause some minor bleeding due to the increase of blood circulation in that area. Like you mine was dark brown, which meant it would have most likely been when we had sex sorry for TMI, the day before.
This time I have had some similar bleeding, only lighter and earlier, it's more of a streaky appearance in my discharge, again sorry for TMI, so I'm trying not to let myself worry, I know it's hard, but there is more chance of something bad happening the more stressed you become.
My advise, enjoy every minute you have with your bubba now, increase something bad does happen, heaven forbid.