Lump in breast

So about a month ago I found a lump, so I made an doctors appointment. Then a few days ago it started hurting badly so I went in to the doctor all the did was have me make an appointment for an ultrasound but thats in 5 days!!!! I've already been freaking out and now the pain is making me feel worse! It sucks being a girl sometimes!!! Breast cancer runs in my family, these next 5 days are going to be hard!!!!