Baby constantly sucking and gnawing on hand?

My 10 week old has been constantly sucking and gnawing on her hands for the past three days. She's not hungry and won't take a pacifier, so i was wondering what might be the issue. I asked a nurse and she said she'd just discovered her hands, but she also drools. I dont know. The nurse said it was too early for teething, but it sure sounds like it to me. What do you guys think?