Right side boob pain

Kayla

I’m so new to this! I don’t even know if this will post correctly so someone please tell me if I did it right! Anyways I was tickling my son when I got a sudden pain in my right boob near armpit! It hurts bad! Aches terrible touching it or not. I’m trying to get pregnant tested last night and negative. Period was due today and nothing. Thoughts opinions?