I keep reading about everyone getting growth scans or other additional scans in the third trimester and most of my friends have had similar. I am 30 weeks and have only been offered the 12 & 20 week scans and that's it. My pregnancy is low-risk (obviously a good thing!) so I guess that's why, but 20 weeks between the last scan and the birth feels like a very long time! I wondered if you can request an extra scan or are they only for certain medical conditions?