
This is why I have never gone with scans

Even if I was told no, I'd still hope and be waiting until the due date. And then, probably go for x-ray to confirm empty if nothing happened.
I have one of mine who up to 5 weeks, looked easily carrying a reasonable sized litter. However, as the weeks passed, she didn't seem to increase at all. She had one (bitch) puppy by C.Section (she was big) but no sign she'd had any that she'd absorbed. That girl, who I had high hopes of as a brood bitch, had 2 puppies in her first litter, and then this singleton. The best laid plans. We had her far more successful litter sister (made her UK title which for me was a huge plus as she was Canadian bred and one who came home with us) who I never felt was going to be such a good brood bitch as her sister. She had 9 puppies albeit because the vet delayed doing the 'Section she too needed, only 4 survived. But that's a story I've put on here before.......
Hoping you do have puppies!!