Your question is just peculiar. Why would it be "heroic" in such an instance? I do think it's heroic when a pregnant woman finds out she has cancer and puts off treatment until after the birth of the child.
I was talking about women who have already had cancer, and THEN proceed to get pregnant (often when they already have children), knowing it's more likely than not that they'll die before the child finishes elementary school. Most FReepers would think that was just fine, but then say it's obviously "selfish" when a very healthy 66 year old (who could pass for 55 to physicians), who actually has a longer life expectancy than the thirty-something woman with a history of breast cancer, decides to have a baby.