I'm going in for my 20 week scan next week. I didn't have any ultrasounds with DS who was a planned homebirth turned c-section. This time I'm doing the 20 week scan to make sure that my placenta is not implanted over my scar. I'm basically planning to tell the technician that I only really care about where my placenta is and that if they want to spend a few minutes looking at major organs that's fine.
I haven't been able to find any compelling reason to do all the measurements that they usually do (anyone?). They don't seem very accurate and I doubt they would change anything for me at this point, especially since I'm already planning a hospital birth. I know that the technician may be reluctant to keep it short (like less than 10 minutes max), but I figure once I know where my placenta is I can always just stand up and say sorry but I'm done.
Does anyone have any experience with keeping the 20 week scan short? Or any insight into reasons to get things checked besides placenta and major organs?