Hi, just wanted to know what is "normal" to be seen at about 5 weeks gestation on an external ultra sound?

Basically i had a dating scan, and i just read the report and all there is is a gestaional sac, no yolk, no pole nothing. The sac put me at 5 weeks 2 days. which i dont know if I would have been that or a little earlier as i dont know exact date of ovulation....

Does this sound like a blighted ovum? Should i still keep faith, please help me, i cant stop crying and i am just devastated.