Boob issue

Hey ya'll, so AF is supposed to come on 9/5 and of course I'm hoping she doesn't. But today my breasts started leaking lol. That's the best way I can describe it. Do any of ya'll have any idea why this may be happening? They hurt too. I also have cystic breasts I don't know if that contributes, just got told that about a month ago because I had lumps. Anyways any insight would be great!