
I have only ever had experience of this happening to one of my girls when she was in pup.
The scan showed 5 pups with heartbeats albeit one pup was larger than the other four.
She went on to have one good sized healthy pup with no other problems.
There was no discharge before she had the pup but after he was born she did pass some
not very nice yeuch stuff for which the vet prescribed antibiotics.
Though she still showed symptoms of pregnancy there was no visible movement from the pup
and putting your hand on her abdomen left you with the is she or isn't she question.
I didn't have her scanned a second time but decided to be around for the due date just in case.
She did have another litter 2 years later with no poblems at all.
Joan