Dating scan date change
This is frivolous really, but anyway I'm curious...
I was sure when we'd conceived due to ov date, DTD days and when symptoms started. We had a private scan at 7+1 (by my dates) and they dated me at that. The lady scanning me said 'your dates are spot on, don't let them mess you around and change it'.
I had another scan due to bleeding and working myself in to a tizz at 11+1, and the private scan put me at that also. When I had a dating scan at 11+6 at the NHS it put me a 12+2, so 3 days on. I'm assuming mine will be a big baby. I had a baby with a 6ft man (I am not particularly tall, my bio-dad was 6ft 4) and had a 9lb 5 baby in '96, and he's now over 6ft 6.
My husband is 6ft 3 and very broad, his sister is 6ft, so I am thinking him+me could equal a bigger baby than before. Questions:
1. How could a scan 5 days apart date me 3 days differently?
2. Assuming my original dates are right does genetics play a role at such a very early stage? Is the 12+2 (vs 11+6) because baby is bigger than average? Or do the variations start later in development?
Thanks for shedding any light!