possible misscariage at 9 weeks??

Jamie • Baby # 3 on the way.
So 2 weeks ago I went to dr and measured 6weeks5 days on ultra sound. Today I went in and baby measured 7weeks6 days. So literally 6 days behind. Dr said she's "a little worried." And that up to 5 days behind is normal but not more than that. Literally left with no answers. Baby had a Heartbeat still. But it just doesn't sound good... 
anyone with similar experience?? Please.comment 

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