I have a 2 yr old Great Dane who would be 37 days pregnant today. Two weeks after she was bred she got a vaginal infection and was put on antibiotics. At her vet visit they did an ultrasound and the vet admitted that she's not "great" at looking for pups but thinks she saw 2-6 pups. At her recheck at 30 days they preformed another ultrasound however said they couldn't see any pups at that time but Raven was "extremely tense" when anyone touched her tummy. Over the last few days we have noticed her nipples getting much larger, rounder belly, sleepier, eats more, wants to cuddle ALL the time!! Could she be pregnant but just hid the puppies tensing up?