Breast clinic appointment

Hey,  

I'm 25 and found a lump in my upper right quadren of the breast, I went to the GP who reffared me on a TWW.  Breast cancer is in the family, my mum had it at 45 and my mums 1st cousin has it currently.

Just wondering what people experiences of thier appointments are? Will they do a mammogram or just a ultra sound? 

Thanks x