You'll only know once u give birth and start breastfeeding. We know frm the number of wet diapers and baby's weight gain. Nth you can do now during pregnancy. Some moms I know try to eat some milk boosting supplements in the last few weeks of pregnancy for e.g Cashcow frm Legendairy Milk (aft 36 wks only).
Don't worry. you will have enough milk supply when your baby born. be ready for best breastfeeding journey. https://sg.theasianparent.com/how-to-increase-breast-milk-supply