Symptomatic breast clinic appointment

Hi all, my names caitlin im 20 years old, around 2 months ago i noticed a small lump on my right breast, it soon disappeared after 2weeks. 3 weeks ago whilst laying in bed i checked myself again and found a larger lump in my left breast, my left breast also aches when i touch it. I have since gone to my gp and the nurse confirmed the lump and made a referral for a symptomatic breast clinic appointment. I was shocked to of recieved my letter from the hospital the next day. It states i will be seeing a breast surgeon.  Im just wondering, what should i expect at my appointment?. Thankyou all and hope you are keeping safe x