Between 2000 and 2009, pregnancy rates for U.S. women fell by 12 percent, or nearly 6.4 million pregnancies. It's the lowest rate in 12 years.
For teenage pregnancy, the rates reached historic lows in 2009.
While pregnancy rates for women under 30 fell, rates for women older than 30 have increased steadily since 1990.
Specifically, the number of women between the ages of 35 to 39 becoming pregnant has jumped by 30 percent since 1990.
