Bf on my period

I am having a hard time here! My baby is 6 wks old and I just had my first period. Since day one hes been bf no supplementing needed but does take a bottle of breast pumped milk here and there. Well now with my period I notice I am not producing as much he is still hungry jo matter how many times I feed him so he has been drinking mainly from bottle but I'm terrified that with time my stored milk will run out. What can I do? Does this mean I will most probably dry out eventually. Help