Wombat early scans are notoriously inaccurate with CRL/dating. My scan last Thursday put me at 5+4 when I was 6+3 and I know exactly when fertilisation took place as I had IVF! Tuesday this week I had my scan at the clinic and they measured me at 7 weeks (so spot on for 7+1). My advice is not to worry. Your bean is so small at this stage the error margin is huge. They'll be much more accurate at 12 weeks.
Looking glad your scan turned out ok - I cried too at my reassurance scan when I saw the heartbeat 
Parsnip I'm hoping yours is a false alarm, thinking of you.
Pleased to hear so many bosses have been so supportive and happy to hear pregnancy news. Dreading telling mine as he's a total misogynist, so not in any rush to tell!