I am a 19 year old female I missed my

Patient: I am a 19 year old female. I missed my periods for 3 months. My doctor told me to have birth control pills for 5 days. After which my periods started. My blood test was done during my periods, my prolactin level is 31.7 ng/ml. My FSH, TSH and LH levels are fine. My ultrasound of the stomach is also fine. What should I do to decrease my prolactin levels?

Doctor: