Sore boobs

Hey guys! So I usually get my pre-period symptoms about a week before my period start date. Sore boobs, mood swings, etc. But this month, my breasts started hurting really bad a full 12 days out from my period which is not normal for me. Google says that pre-period symptoms 2 weeks out from your period are normal but I can’t imagine why this would’ve suddenly changed for me. I’m still 6 days out from my period as of today and I took a pregnancy test last week that was negative. If this has happened to anyone else please let me know! I hope that having sore breasts for a whole 2 weeks out of the month is not my new normal 😭