hi totallyfloaty - just saw your email about being pregnant on a flight. I did a 24 flight all n all in my first part of pregnancy. I did struggle with my circulation even with the dvd socks. The worse part was when i went to sleep my legs were vertually dead when i woke up. I had to walk round loads. I wouldn't worry about it just try and keep the circulation going as much as possible.
I have done shorter 9 hour flights aswell whilst pregnant. I needed a break from my son as was getting really tired towards the end of my pregnancy and i just scraped in my trip arriving home before my last day that i was allowed to fly up to. That flight was fine no probs with the circulation plus as I had a bump I got an extra legroom seat. the trip really did me the world of good as me and my sister went on a relaxing cruise using the pampering of the spa and facilities onboard etc and we didn't take my son so I had the time to relax before the baby popped out.
Hope that may have helped you a bit.