We had a singleton this past summer and although I was of course worried, we did take all the necessary precautions. Thank goodness that she was more long than chubby... and our Miss Lily delivered with no problems, or complications.
Our Penelope gave birth to 6 puppies just a few days before, so we had the full spectrum with these two whelpings. All are fine and have gone on to their forever homes.
Good luck and please keep us posted!