I honestly can't even remember the last time Aunt Flo came to visit. I have my 12 week u/s on Thursday - so who knows, may get a new date then?
I think it's best to remember that no pregnancy will ever mirror a magazine / book recommendation - may be similar, but not the same. Everybody is different and our bubba's are growing differently too.
One magazine said at 11 wks the baby fetus should be 7 cms in length! Although the u/s measured it which gave us an estimated time of 11wks based on the measuresment of 4.3cms! Bizarre!