The earlier scan is usually the most accurate....strange that she would say otherwise. All embryos measure about the same for the first few weeks, as its a primitive developmental thing, by the time you hit 13 weeks, there are differentiations in the embryo size. Other measurements later on might just mean you might have a bigger than 'average' baby. I was measuring about 6 weeks ahead of dates with my last pregnancy and induced at 37+4 (for high BP) she was born 9lb8oz (4.3kg), so was just a big baby which is why my measurements were always ahead.

I would be hesitant to move my due date forward, especially if bubs is sitting breech. If they do then tell you that you *need* a c-section, they will book it before your due date (for some strange reason......not like they can't do it with the onset of labour......), and if your due date has incorrectly been moved forward, then you will be delivering a very premmie baby who risks respiratory distress and a stay in the NICU. Leaving your due date as the later date stops this from happening.

Best of luck for the rest of your pregnancy.