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darker blood in your period can be from old blood coming out of your uterus.
you most likely are taking flagyl or metronidazole for your bacterial vaginosis.
you are right that stress can cause irregular periods
you may benefit from going on birth control pills to help your periods be more regular
let me know if you have questions.
that is right, you are on oral contraception
stress can still make periods irregular while on the pill
it will get more regular once your stress is better