I have an iron plate in the head of the humerus of my right shoulder. Am pregnant. Is it safe to have a normal vaginal birth or csection?

Birth. What does a plate in humerus have to do with making child birth decision ? Whether you can deliver normally or byc section depends upon the size of your baby with respect to size of your pelvis, and the progress of labor.
No impact. The internal fixation device in your humerus should not effect child birth.