Jay Jay,
I hope these eases your mind but I had bleeding very similar to yours at 15 weeks where I was standing in a pool of blood tmi, I was one minute talking to a co-worker about my obst then all of a sudden a warm sensation and that. I visited my obst straight away that found a heart beat and all was ok after a few days further of brown blood. On the ultrasound they could see a black area where they said the haemorage was coming from.
I wish you all the best as everyone has said stay calm and hopefully have some time to put your feet up.
Bec