Sorry pizza, only just come back to the thread and your question.
Well, red blood (or pink) is fresh blood which means it is either the result of implantation bleeding (like Beamae above) or a heamatoma like I had (a bruise basically, the blood has to leave and is bright red) Dark brown blood means it is old blood and therefore more a sign, I was told, of a miscarriage.
At this early stage, I honestly think the blood is implantation bleeding, coming our now, if you see what I mean. Presumably, they would have seen on your scan if you had a haematoma?
I so hope it is all ok for you. Just try and relax as much as you can. Very hard, I know, I was an absolute wreck.