Breasts after breast feeding and pregnancy

I am in between about wether or not I want to breast feed. before becoming pregnancy I was right around a B 36 in bra size. I want to breast feed when my baby is born but I worry that after I stop breast feeding that my boobs will either go back to the size they were before pregnancy or I am afraid that they will be smaller than before pregnancy. just curious as to how many moms breasts stayed large after breast feeding?