Hello. Don’t quite get your question. If you are wondering if you can pump sufficiently for the baby while you are on your period, maybe not. What I do to maintain supply when I realise that I am pumping lesser is to eat lactation bakes, eat milk boosting food and drink lots of water. Hope this helps;
Milk supply will drop temporarily during period for some moms. But it's just temporary. Taking calcium supplement may help. Important to keep hydrated too and keep to your usual way of boosting milk eg power pump or take milk booster.
My supply during menses period didn't drop. Everything is normal for me. Currently 15 month pp. Menses came at 10 month pp.