i know wrong section, but i was jsut after any ...

i know wrong section, but i was jsut after any quicker answers. i was just trying to express using a medela mini electric. but was wondering if i am doing something wrong. between both boobs i can only get around 40 MLS on a good day i get 75MLs tops. surely that cant be all i am producing. i have been trying to express heaps but they dont seem to be producing anymore. isnt it the more bub feeds or you express as well the more your suply builds up ? the flow just stops. i thought maybe if i stop for a minute and try again it may help but i duno