Ive always have had period on time and for a week this time period is going on more than 9 days. its not a lot of blood coming out but im worried why its not stopping. what could cause this?

There are various causes as to why periods become abnormal, but your personal circumstance needs to be taken into account: life stressors, hormone contraception, bleeding disorder, endocrine disorder, and cancer. Please reference my family doctor organization website and if concerned, please see a clinician https://familydoctor.org/condition/abnormal-uterine-bleeding/