Thanks so much for your kind messages.
I'm afraid it wasn't good news. The scan showed a 5-6 weeks pregnancy, too soon to see a heartbeat (or determine there was none). They couldn't offer me anything other than another scan appointment next week, 'just in case' it was a viable pregnancy and I was wrong about dates. We were 100% sure about dates, and they actually did believe us on that, but it's the policy. I understood why they were in that position.
But it means that, although the heavier bleeding started as I was leaving the EPU (forgive the TMI!!), they couldn't offer medical management and so now I am in a lot of pain and discomfort, on top of the grief and disappointment of the loss.
The next couple of weeks are going to be rotten - we've been here, unfortunately, before, just like a lot of you others on this thread, and know what's coming. 
One thing that struck me as I was waiting was the number of stressed women who came in to reception after being referred from A&E or through self- referral because they were bleeding. I don't know all of the outcomes, but I expect for some, they were good. We were shown in to what we called 'the crying room' (they called it 'the quiet room') after our scan to speak to someone about what was likely to happen now (as if we didn't know!) and to 'have some time to assimilate'. If all those ladies had similar news, then the queue for crying would have been very long! Although for me it was bad, bleeding in early pregnancy must be very common indeed.
Having said that, a nurse comforted me just before my scan with the words 'there are lots of reason for bleeding and pain in early pregnancy' and I felt a bit cross about my hopes being raised minutes before a scan that would tell anyhow. By that point we (DH and I) were almost totally resigned to the sad fact it was a miscarriage.
I'm in a lot of pain this morning, which in a twisted way is distracting me from facing the fact there is no baby and from thinking about what next.
Sorry for the lack of cheer. Nobody knew I was pregnant and I've now only told my mother what happened. So I guess I'm just sounding off.