Normal boob pain? Af due in 9 days

So for the last 3 days I’ve been having some serious left boob pain like clockwork. Started under my arm on the furthest outer side of my boob and then it came further in on the side of my boob then on the top and side and then further down closer to my nipple and now on both boobs my nipples are sensitive. I’ve never felt this. It was so weird when it first happened that I thought I was having a heart attack since it was the left side 😂 Googling got me scared. But anyways, my period is due in 9 days, can this be a good sign or is it normal?