hiyaaa hun ... hmm i think your chances are always much lower after seeing a HB, i think they say after 8 week and seeing a HB it dramactically goes down.
i had a scan at 7 weeks and then saw my huge baby last week at 13 weeks lol.
its hard to tell whats going to happen, but its definatley very positive that you saw the HB and probably unlikely that you wil misscarry. enjoy christmas, and smile that you saw that HB!! before you no it you will be 12 weeks and seeing your baby on a much larger scale lol xxx