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:
“[When asked: “Will not woman suffrage make the black woman the political equal of the white woman and does not political equality mean social equality?”:] If it does then men by keeping both white and black women disfranchised have already established social equality!”
—Anna Howard Shaw (1847–1919)
“The frequency of personal questions grows in direct proportion to your increasing girth. . . . No one would ask a man such a personally invasive question as “Is your wife having natural childbirth or is she planning to be knocked out?” But someone might ask that of you. No matter how much you wish for privacy, your pregnancy is a public event to which everyone feels invited.”
—Jean Marzollo (20th century)