Period is usually late, but all of a sudden early?!

Alexandra • 25 years old. Proud first time mother of 1. Living life with my new little family: my daughter, my fiancé, and our sweet kitty 👨‍👩‍👧 🐱 Enjoying every moment with my little one ❤️

My period is usually really late, arriving between day 35-42 typically, and all of a sudden I think it just started, but I’m only on day 26 of my cycle. I have PCOS which explains my late periods, but I NEVER get early periods. Any explanation?