I have just my 12 weeks scan and I am dating a lot earlier than expected. I would be 12+2 by LMP and 11+6 by ovulation but I have measured at 10+6 so smaller than expected. I have been rebooked for the nuchal scan 2 weeks today but if baby catches up they could be 13+6 or even 14+2. I am aware that the scan and blood test needs to be done by 14 weeks so I am a bit worried that the rescan has been booked too late. Sonographer just said I must have got my dates wrong, but if I got them that wrong I would have got my positive pregnancy test at 4dpo which is very highly unlikely. Also not sure if I should be worried that baby is measuring small or whether it is just the measurements were a little off.