12 week scan

Had my dating 12 week scan yesterday. Saw little one moving around! The picture they printed for me is awful!!! Baby wouldn't stay still so it looks like a little alien with a long neck and weird head. Sonographer said everything looks good but the picture scared me!! Little monkey was also upside down, face punting downwards haha being naughty already! Anyway, has anyone had their dates changed following their scan? I thought I was bang on 12 weeks but I've been put forward 6 days so I'm 13 weeks today! Original due date was 6th September, changed to 31st August