Don't spend money on breast pads during pregnancy unless you actually start leaking. For most of us, milk only comes in after the baby is born, so save your money.
My milk didn't come in until the 3rd day after my C-section. The hospital staff guided me through breast-feeding and latching, so don't stress about it during pregnancy.
I heard some girls say they notice tiny wet spots on their clothes in the 3rd trimester. It sounds a bit surprising, but I think it's just the body preparing.
Actually, proper milk only comes after you deliver, yaar. During pregnancy, you might just get a few drops of thick colostrum in the last weeks, which is totally normal.
I understand how stressful it is to think you won't have enough milk if nothing is leaking during pregnancy. But honestly, milk only comes 2-3 days after birth, so please don't worry.
True milk only comes in a few days after delivery. Some women leak colostrum in the third trimester, but if you don't leak, that is also completely normal and doesn't affect your future milk supply.