How do i know which size of nursing bra to buy? Intending to buy from qoo10, but afraid that cutting not accurate.

I also suggest u get uniqlo bra tops. I am also a A cup but pregnancy plus the last few wks ur breast will be bigger n then when the milk comes n it's full it's also slightly bigger so a B or C is good. It's usually 29.90 but every few wks they have discount at 19.90 then I buy. Don't buy online, possibly waste time n money. Mother care or those maternity clothes online shop will have booths at baby fair so u can get then too. Suggest to u to get when at abt 8months preg, more accurate but also remember to give more space as milk come in will become bigger