Amanda, being raised by her Catholic grandparents after her mother abandoned her, was determined to avoid pregnancy and become the first in her family to get a college degree.

CNN: Rural America has a teen pregnancy problem

Although nearly all unmarried young adults say it's important to them to avoid pregnancy at the present moment, a third also say they would be at least a little happy if they did find themselves pregnant.

WSJ: The New Unmarried Moms

Crystal's nervousness is understandable - though doctors say that if HIV-positive women take anti-retroviral drugs during their pregnancy and avoid breast-feeding, the chance of their baby carrying the virus is tiny.

BBC: Teenagers - anonymous

So the advice we give to all pregnant women during pregnancy is to try and avoid getting too hot, whether it's just during exercise or swimming in a warm pool.

BBC: Exercising during pregnancy

"It's a gift that can really last and evolve as the baby grows, " said Ms. Restoin Roitfeld, whose website, Romy and the Bunnies, features interviews with other chic mothers as well as tips on how to avoid stretch marks and tame post-pregnancy hair.

WSJ: A Guide to the Best Baby Gifts

To minimize the chances of harming the fetus, doctors avoid medications known to cause birth defects and those too new to be declared safe during pregnancy.

CNN: Pregnant with cancer