First period after birth. Heard it drops milk supply?

Renee 👦🏼👼🏻👧🏻👼🏻👼🏻👼🏻👶🏻 • Stay at home mom. My family is my life.

I've heard that starting your period can really drop supply. Is that mostly for women who still have not yet established a supply? Or could it happen any time? I've been EBF for 11.5 months and just wondering if I should be concerned about my supply dropping suddenly. TIA!😀