What is the question mark for? Did you add that or did she? I'm assuming you did, but just thought I should ask. I just went and looked at my own ones from 7 and 8 weeks. The 7 week one looks very much like yours here with a lot of open space in the gestational sac and just baby off to one side. In my 8 week one, there is less space and baby is a bit more central and takes up more of the sac. I know you can have a large gestational sac. I wonder if it was because she was rushed and didn't take the time to get a better shot that it gives the appearance of a relatively large sac. My 7 week one was really rushed and just abdominal, but the 8 week one was more extensive and was vaginal and in that case they were specifically looking for the cause of the bleeding I was having. I suspect because of that, she took more care and got a better view and maybe that is the case here too.