Not all women have scans for fun. I had a 6 week scan to check if it was a "viable pregnancy" as I had previous miscarriages. Then I had bleeding and they scanned again. Then I had the NT scan, because that was my choice. And then the 20 week scan which is standard. I think it's unfair to suggest that women don't know their bodies. Some women need them for piece of mind as Trillian said. I have a friend who delivered her baby at 20 something weeks because the bubbas brain had grown on the outside of his head, had she had the NT scan whilst it still would have been distressing it wouldn't have been as much. When she went in at 20 weeks she thought everything is fine, and to some people that extra 6 weeks would have made a difference. I also have a friend who nearly lost her life and her childs because she wasn't monitored closely enough. I see your point but there are plenty of cases that are the opposite too.