Pregnancy and childbirth used to be the most common cause of death for women of childbearing age. In some parts of the world, it still is. But the best of modern medicine has not made pregnancy totally safe.
In 2004, 654 women died of pregnancy in the United States. That's close to the number of people who died from firearm accidents (661 that year), or of meningitis (720 that year).
Pregnancy is still physically dangerous. Women still risk death to carry babies to term. It must be done of only their own free will.