I think maybe it was to early. Could your dates be out by a few days??
If there was a sac & fetal pole that is good news.
I hope the dates are wrong & when you go back there is a happy healthy baby in there with a heart beating away.
Bleeding isn't always bad. Remember a lot of us bled during our pregnancy and have gone on to give birth to happy healthy babies (I am one of them). I bled from 9weeks till 18weeks. Bright red, with clots!!
Also did they do an internal or external scan??