Although the US still has a long way to go in preventing unintended pregnancies, an article published earlier this month in the New England Journal of Medicine had some good news: The proportion of US pregnancies that were unintended dropped from 51% in 2008 to 45% in 2011. Lawrence B. Finer and Mia R. Zolna of the Guttmacher institute analyzed data on pregnancy intention from the National Survey of Family Growth, and note that the rate of unintended pregnancy declined for every income and education group and all racial and ethnic groups. Disparities still persist -- rates are still highest…