7 weeks 1 day abdominal ultrasound...maybe twins?

Went in for an abdominal ultrasound today and some angles we could see two sacs and at others we could see one big one, but no heartbeat(s) :( the lady said that I could have a band in my uterus causing it to look like 2 sacs or it could be twins. But she couldn’t confirm because of the heartbeat situation. Thoughts? Anyone had something similar?