I got my three month old kitten from a shelter and took her directly to a vet for vaccination where she was given a shot. It's been two days since vaccination. She was very calm and weak the first day and slept for most of the day but she was feeding on dry food properly. Then when she started to come out of it and being active again she started coughing. It's not severe but I feel bad for the poor thing. Is it normal as post vaccine side effect for cats to cough?