9 weeks no heartbeat

I'm 9 weeks today, went in for early pregnancy scan but sonographer said she thinks its too early and has booked in for next week rescan.

She said it looks like 6 weeks and there is no heartbeat. but everything else looks healthy.

my periods have always been irregular its somewhere around 31 to 33 days, and my Lmp was 23rd october...

Are there any hopes or is it a miscarriage?