She is lovely, I love goldens.
Have you noticed her getting bigger around the middle at all - I would guess if she was pregnant in the shop then she would be almost getting ready to pop now, and you should be able to see visible "baby bumps" on her sides.
If it helps, here's a couple of photos of my pregnant girls, where you can clearly see the "baby bumps":
Mira, 13 days pregnant:
Rowan 14 days pregnant: