Breastmilk at what week of pregnancy it will start?

Hi mommies, At what week during pregnancy nagsstart magkaron ng breastmilk? Im currently on my 34 weeks and no sign of milk so far. Lumaki lang boobs ko, probably because nag gain din ako ng weight pero hindi sya masakit as in parang normal boobs lang na feeling pag walang mens. Although nung nasa early trimester ako, sumasakit at mabigat ang feeling. Ano kaya mga signs na nagsstimulate or nagpoproduce na ng milk aside sa may tumutulong gatas?