I had that. I was sent away to come back a week later, they said they would book in a D&C there and then, there was no sign of a baby but that it was a formality for them to do a second scan beforehand.
Luckily they did as the following week they found a heartbeat!
They said it still didn't look good though as the sac looked misshapen, but we got through and the 2 year old currently tearing up my house and terrorising the cat and her sister is proof that it was all good in the end.
I hope it works out for you too!