Most Emergency Departments are unable to do U/S to check for things like retained products. It takes a highly skilled (and trained) sonographer to do that. They can often check for a heartbeat in later pregnancy but still without measurements etc. EPAS was created because of the ED limitations in skill and experience with early miscarriage and pregnancy complications.
Where I work, we get 4 emergency ultrasound slots per week day (not just for early pregnancy assessment either). There is no service on weekends. We refer our patients to external ultrasound services because they have more spots, more sonographers and are able to provide the service the public system cannot. They also have emergency slots so try to contact them ASAP to let them know you are bleeding. They may be able to fit you in earlier.

