Just got back from MW appointment (was booking in for anti-d) and she meausred me and said I'm measuring just over 30cm (apparently it should be 1cm for every week you are?), so I'm therefore big for dates. She's asked me to go back in two weeks for more measurements and if still big then she's sending me for a scan to 'see whats going on in there'. Anyone else had this? Anything I might need to worry about?