hi Kirsty,

I can't offer you any explanation, but i can tell you that i am going through a similar thing right now, i have had it over a week now and is brown, im trying not to stress as i have been told that brown blood is old blood making its way out, could have happened at the time of implatation but is just cleaning out now, well im holding on to that explanation and hoping that is all it is, i have my scan on thursday, so that will tell me if it was anything sinister or not, hope you OB gives you reassurance tomorrow!