7 year old jack russell acts fine but seems a little shaky

we just got our jack Russell from a family member over a month ago, a few days ago she wet the couch and bed while sleeping / laying there, and now she seems to be shaking a little on and off. She acts fine and runs and plays and still eats , but I cant get her into the vet until Monday. Should I be more concerned to take her somewhere sooner? or does this sound like fairly normal behavior?