pickle, I think they do (I mean, I dunno and it's possible). TBH, I am quite angry with them as I think they just think 'oh, they paid for one set of sperm and now they might pay for two, great, more money for us'.
pez - they say maximum 18 weeks, and she did say she'd try to make it less as it's very likely to burst on its own before that, because it's so big. But she was much more reassuring than the GP and managed to talk me through warning signs and so on.
How exciting to be thinking of fundal heights, though! Ooh! How are you feeling in yourself, btw?