
Same here with my Jozi, was quite shocked that she was obviously pregnant looking (to me anyway) at four weeks,a dn to everyone at 5 weeks. Seh si a big roomy bitch so didn't expect to be seeing it this early, but ti is a secodn litter.
She was reasonably large last time by the end but carried a lot of water as only produced 4 live pups and one stillborn. So I don't think you can go by size. Her Mum who is much more neat had 9 large pups in ehr first litter and even though she looked pretty pregnant I don't know where she kept them.