I haven’t had period in 2 months. I am not pregnant. What will doctor do for me? What should I expect? I’m 17. Should I worry? Thank you!

Blood work. She is going to check hormones and also give you a medication hopefully provera ,Donot worry it is just a hormonal imbalance .
No period: 2 mo. At 16, there are emotional stresses which can make your period "irregular". An ultrasound picture and some lab tests may be done, as well as making sure you are not pregnant. Ask about oral birth control to "regulate your periods" at this time (unless there is a contraindication).