Breast pain

liz

I am 13dpo so my calendar says and i am suppose to start my period tomorrow but I have been having really bad breast pain. I took I pregnancy test yesterday and got a bfn. Not sure what it can be. I have never experienced this pain before besides when I was pregnant with my first born. Any thoughts on what it may be? And no this is not normal pms breast pain either. It's worst! 😩