Breastfeeding low supply

Hi I’m in my 2nd week post partum. My milk supply has been very low, per pump both side only 15ml can't seem to increase. Is this normal? Will it slowly increase? I'm taking sunflower lecithin & cash cow fron legendairy for 4th day now, nothing changed. I pump every 3hourly. Anyone had the same experience? Please share with me your experience, whether your milk did increase!