EE driving 523 was leaning forward in chair, shovel operator loaded truck which had larger rocks. Because of way EE was seated, head moved forward & contacted steering wheel which caused bloody nose. EE contacted supv, told supv EE was rocked by load. EE was asked if they wanted to see EMT but denied & finished shift. Employer was notified 5/10/19 EE would need phys therapy & Rx