Come on. The other knee?

We just went in to see our rheumatologist a week or so ago. He checked out her right knee and said everything looked good. Checked other joints and didn't seem to be any problem. Now, the last three mornings when she's woken up, she's complained of her knee hurting. I ask her which one and where and it's the left knee. I really hope this hasn't spread to the other knee. I'm waiting for a call back from the doctor to see if we wait it out for the three month check or come in now.