So much pain😩😭 (please help anyone)

Emily

Today I'm on week two day idk of my Larine 1/20 birth control pills. I started lightly spotting (I think anyways) today. I was sitting down at the beach and all of a sudden my left boob outer side (side closet to my arm) became super sore. I wanted to cry it hurt so bad and it wont stop hurting. I'm in literally so much pain and idk why😩. If you can tell me what this might be that would be so helpful. Thanks