What could it be?

Raine❤❤ • 2/26/06 9/27/07 3/19/09👼10/12/18 🌈 baby girl 🎀 3/16/2020🤰
So yesterday my boobs started hurting really bad. Now I have milk coming out of them. I don't think I'm pregnant because I got my period last month. My breast hurt so bad that I had to take pain relievers. Has anyone ever experienced this or know what it could be. I have an appt Monday but just wanted some insight.