our border terrier had her first litter two weeks ago (3 boys looking for good homes!) she didn't really show any obvious signs of being pregnant till a week or two before the birth - obviously we still couldn't be sure it wasn't a phantom pregnancy, but just a few days wait proved it was the real thing.
i am trying to work out how to add a picture...can't for the life of me see how!
I worked out that Bunny was pregnant - despite the morning after jab - when she was six weeks. I think if I had been looking for it I would have noticed earlier.