That's a real worry. i'd go get a second opinion. It could be a sign of an ectopic pregnancy, or it may just be hiding where the sonographer couldnt see it. Depending on when you ovulated, your dates may be wrong.
I know I'm freaking right out this will be miscarriage number 14 if it doesn't end well and I can't cope anymore....

The lady who did the scan said to go back in 7-10 days