This is Dr. David
no, you shouldn't be worried.
darker brown/black blood just means some older blood from the uterus is coming out at this point.
this darker period flow is 100% normal.
you don't have to worry.
focus on eating foods higher in iron like spinach and beets and steak which can help replace the iron lost in the blood from your period.
let me know if you have other questions.
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