DF I'd not worry too much about the dates if you can help it (easier said than done) as only 5% of babies arrive on their due date anyway. From what I've read, the most important reason to get accurate dates is for the NT scan - after that, its less important and dates get less accurate as time goes on.
chooster - sorry to hear about your stress. Remember that 1 in 200 is still low odds - but awful for you to have got yourself psyched up for today.
japhrimel - have you tried front crawl? I've been told that you should try to stick to crawl as much as possible anyway, even when you're pregnant. Apparently, even pro swimmers whose specialism is breastroke will not warm up with it as it puts too much pressure on your knees, hips and back!
Also, remember that even the longest wedding service is generally not much more than 1h20 (I'm thinking of a large, full, Catholic mass - CoE services are 40mins with 3 hymns, 1hr with 4 hymns) and if you make sure you have an hour or so before the service where you don't gulp liquid, you know that you can last that long. I have a friend who went to see the dr as she peeed so often, and he made her realise that it was 80% psychological. By this stage also, our bladders should be under less pressure than in the 1st or 3rd trimester, so there isn't much physiological reason for needing to pee! And if you take a load of snacks to eat, you won't go hungry. IME caterers at weddings are really good if you explain to them that you need to eat in an emergency or could you have an extra piece of bread because you can't eat XY and Z.
Anyway, back on the bra topic - I got measured today and have gone up another three cup sizes! I now have proper page 3 statistics (well, apart from the lack of waist .
Strix - underwires keep your boobs in place which, if you're big busted anyway, is well worth any extra discomfort of the underwire. And if you have been measured properly (and no, M&S DOES NOT COUNT) then you should hardly feel it at all. But if you're happy in non-wired, then why go to the extra expense of getting wired - I wish I was like you on the bra front!
Right, off to try on my new clothes - hurray for having trousers I'll be able to do up again!