Usually, early scans are for those with risks or those who have had a previous loss. However, my hospital has a drop in system... If you want reassurance or have had spotting or something, you can drop in, take a ticket and wait. Maybe enquire at your doctor's surgery about it? Or call the hospital?
We are getting an early scan privately. It costs £110. It's because we wanted to know all was okay before Christmas so we could tell family.
There are lots of scanning centres that offer early scans (Babybond is a well known one) but as the lady above me said, they do cost.