Hi, Thank you both for your responses. Melissa - you really put my mind at rest. I read your post last night and then woke at 3am with a bleed (brown blood) which i have not had in over 2 weeks, but was reassured by your story.
Having said that we went for the results of out 12 week nuchal scan today and were told we now have 1-96 chance of down syndrome and our GP is sending us on for a Amniocentesis. This pregnancy is certainly been one stress after another. But thanks again for your advice.