hi all! Thanks so so much for all the well wishes about the shop opening! It went really well, we got through 17 bottles of bubbly (not me though)! and were busy all day. The actual opening was at 12pm, and my Dh stayed there all night on fri, then rest of us there by 7am, and we only just made it! I am completely knackered, (youd think my body would know to sleep, rather than be awake by 5am)
From now on it should be easier, I only have 1/5th of the shop, so just work on Mondays (and do the windows etc) to cover my share....and there is a couch!
Kayzr Im so happy it worked out for you!!
Starlight is everything Ok? We are missing you...
All those with small gaps, hats off to you! I will have 5yrs between DS1 and 2 and then almost another 5yrs aging this time.... I does mean Ive spent the whole of my thirties doing this so far, but the gap makes it easy. (Not that it was planned that way, I wanted them close together)
Cheddar, as Fireflies said, they measure the head to bottom size and compare it to the date they calculate from your LMP, but they only use the LMP as not everyone knows when they ovulated. The ovulation calculation is more likely to be accurate, but even then it can vary by a few days depending on when the deed was done and how long until the swimmers found their egg IYSWIM? The date given at the scan will be the one on your notes, and that they go by from then on, although they will check its close enough to LMP estimate, just in case of growth probs. Hope that helps and doesnt confuse further! 
I think I might try and get some more sleep...... yawn!!