Does Breast milk decrease when period starts?

Hi. My period returns after 6 mths post pregnancy. I really enjoyed life without period!! I’m so sad.. Anyway, I understand that there will be a decrease in the amount of milk ): Is it a permanent one? Or the usual amount will go return after the period ends? Possible to boost the milk supply even after period returns? Thanks ! (I am not ready for my period to be back so sooon!!!) #1stimemom #pleasehelp #firstbaby