I am taking 20mg of methotrexate teva a week to manage RA symptoms. I have protein in my urinalysis. What does this mean and how should it be treated?

Need more info. Protein in the urine is nonspecific. It could be due to the RA itself or the methotrexate. More information is needed on how much protein is in the urine and how much there was at baseline. Your doctor can monitor your kidney function on Methotrexate and recommend treatment should it be necessary.
Probably not related. Mtx's kidney effects rarely include proteinuria. The causes for proteinuria are many. Also, how much protein is important to know. I hope you are getting your mtx by subcutaneous injection. It is 100% absorbed and has fewer issues.