So I went to the exotic vet two days ago to give my guinea pigs a general health check-up and I mentioned them sneezing and coughing occasionally. They said both were completely fine and looked very healthy. Both my piggies are still active and eat/poop well but today I noticed one of them started sneezing a bit, more than usual. She sneezed about 15 times in the span of 30 minutes or so. I checked her eyes and nose and they are clear, listened closely to her breathing and I can't hear anything. The bedding is fleece and hay is good quality. Should I be worried?