Popped back in to the hospital after calling my midwife this morning as I still wasn't happy with how she was moving, and she had told me to go up. She said even a reduction of movements over the course of a few days should be seen, as by the time they stop moving it's too late. It could be a growth spurt (like with my little one) or it could be a sign they're struggling.
I ended up having a quick scan this afternoon as they wanted to check her over and she's fine, lots of movements doing the scan (doctor had trouble getting measurements as she was so wriggly, and I got a nice boot in the ribs) but at least I now know she's definitely okay, she's grown well since the 20 week scan and she has great fluid levels. She has so much more room than I realised too, so do feel a bit silly for that, and that could be the reason her movements feel more subtle- her head is down by my hip and her feet are up near my ribs, with her butt just north of my belly button, so she's basically lying diagonally across.
I would rather make a nuisance of myself than A) sit at home stressing that she's not okay (particularly since we're going to be in Far East Asia for a few days en-route to Aus next week), or B) spend the rest of my life regretting not going, in the rare case that something bad does happen. I have friends who live with that regret every day.
Anyway, I agree it is pretty stressful with all the recommendations, but at the end of the day, the UK has the highest stillbirth rate in Europe, and women need to be made aware of when they might be at risk.