sign of pregnancy or breast cancer?

Megan

my right breast started hurting Monday and itching really bad and then followed my whole right side of my chest hurting lile a deep deep pain. nothing on my left side really other than a little nipple tenderness from me snout to start my period in the next few days. I could be pregnant not sure yet but my dream is sending me for a mammogram today in only 29 I have 3 kids end never experienced breast pain/itchy in just one breast before.. what do y'all think im freaking out here