Thanks, ladies, for the cheering words about weight!
Like you Rosebury, up till October last year I trained (martial arts) 4 times a week, and ate what I wanted but healthily and maintained 10st 4lbish (at 5'5''), which I was happy with as I was very fit, and looked nice (always had relatively big legs, but with lots of lean muscle they're fine). Then I stopped training when we seriously got down to TTC, because there's a lot of kicking and punching to the belly and obviously that wouldn't have been ideal!
So a combination of morning sickness (the sort where you have to eat all the time to stop feeling sick, just my luck), complete inactivity due to feeling sick and probably water retention (my calves look so weird and puffy and firm to the touch in the wrong sort of way if you see what I mean) mean it's just shot on.
And even worse, my fitness has almost completely disappeared - so quickly. I get slightly breathless going upstairs. It's not fair!
Anyway, I'm going to take your excellent advice and put the scales in the cupboard for the next 6 months. And wear my excellent new trousers from isabella oliver which make me look - well, not like i look without them on!