Sorry to hear about your loss. Don't worry - A follow up scan is a good idea. I didn't get one and I wish I had.
My mc was at 12-13 wks when they realised there was no heart beat on scan. I waited a while to see if things happened by itself, but it didn't so I had medical management. My bleeding carried on for a few weeks, but they had told me it could last 6 weeks, so I didn't think anything of it.
Then the bleeding got really heavy and I passed 'tissue'. I had to go in to hospital and a scan revealed 'products of conception' still left behind. So then I had to have a d&c (which was about 6-7 weeks after finding out I had mc'd!).
So basically, what I am trying to (rather long-windedly) say, is that I wish they did routine follow up scans here!!!
Good luck
