Dont' worry about it, check out my pics in the photo thread!
I get it all the time, although at this point am measuring about 4 weeks behind, but I am exactly the same as my first pregnancy.
At 20 weeks my bub was only 1 day out on all measurements

& a growth scan at 34 weeks put him about 4 days behind. I had another scan on thurs, & although some measurements are on the small side I've got a long baby in there again!
You are like me & are tall which really does hide how big we actually are.
Edited by Aliasmum