Viability and Established Pregnancy
A related issue that comes up in this debate is how often fertilization leads to an established, viable pregnancy. Current research suggests that fertilized embryos naturally fail to implant some 30% to 70% of the time. Of those that do implant, about 25% suffer early pregnancy loss by the sixth week LMP (after the woman's Last Menstrual Period), and an additional 7% miscarry or are stillborn. As a result, even without the use of birth control, between 50% and 70% of zygotes never result in established pregnancies, much less birth.
Read more about this topic: Beginning Of Pregnancy Controversy
Famous quotes containing the words established and/or pregnancy:
“Though the railroad and the telegraph have been established on the shores of Maine, the Indian still looks out from her interior mountains over all these to the sea.”
—Henry David Thoreau (1817–1862)
“It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to mathematics, though she is still forbidden to resort to physics and chemistry.”
—H.L. (Henry Lewis)