dating scans that early can be inaccurate. the baby is small so it’s hard to get the right measurement the NHS 12 week scan is the one they go off as that’s your official dating scan x
It’s normal for dating scans to give different due dates! Midwives give you an initial one based off your LMP but scans are more accurate- the 12 week one as Lauren said will give you the most accurate date:)
I was the same, my midwife said I was 11weeks based off my last period, but I went for a scan today and I measuring at 9w&5 days, you may of ovulated late which is what I think happened to me
Mines the same :) also happened with my last Baby. Just means that you didn't ovulate exactly when you thought or maybe your cycles are a little longer than the 28days they use.