“Most girls get their first period when they're around 12. But getting it any time between age 10 and 15 is OK. Every girl's body has its own schedule.” - Kidshealth.org (https://kidshealth.org/)
Some girls get their first period ages 8-15 Yrs old so ur in a OK zone. U r a yr early so I’d just tell your Doctor but prob nothing to worry ‘bout.