I had a private scan at 7 weeks too with my last pregnancy because I was just so worried due to previous miscarriages. In fact I had scans at 5 weeks, 7, 10,12,14 and 16 weeks I was an absolute psycho about it and eventually the private clinic said I couldn't come back until at least a month later haha!
But anyway yes at 7 weeks I saw the sac and a little blob inside that was baby and they show you the heartbeat flickering away. That's pretty much all you can see that early. This is my 7 week scan pic. Seeing the heartbeat is cool though. And the scan was an internal vaginally as its early. I hope that helps hun xx