Long period

Lucia

Hi ladies, I am 30, my period up until now was like clock work, but the past couple of months my period shortened from 7 days to 5. But now I have had my period for almost three weeks straight. I have lower back pain and my boobs have been sore for months. any insight what this might be? I am trying to set a gyno appointment ASAP, just wanted to see if anyone else has experienced anything like this?