Honestly Naomi, try not to worry. I know it's really hard and upsetting, but as you know I had brown and some very dark red discharge/spotting for a week and even passed a few clots, which were tiny, but still freaked me out. I know everyone is different and sometimes this can be a bad sign, but there are so many cases out there when it's just a normal part of the pregnancy.
Again I know it's hard, but there is no point worrying about something that hasn't happened and may (and I really hope) not happen!
Keep your feet up, drink plenty of fluids and stay positive - the mind (as you well know) is a very powerful thing! xxx