Sac and yolk but no baby or heartbeat at 5w6d

Allyssa
 So my dr ordered an ultrasound for some bleeding I had over the weekend. Sono tech said the bleeding from what she could see looked normal and sac and yolk looked good but we couldn't see fetal pole or heartbeat. I go back for follow up Sono in a week but I am freaking out! Someone please tell me they have had this happen to them and went on to see development and heartbeat?