The rate is four times that of higher-income women, a new survey reports. WASHINGTON - Overall, the rate of unintended pregnancy - 49 percent of all pregnancies - has remained stable in the United States, according to newly released government data. But when broken down by income, disparities emerge: In 2001, US women living below the federal poverty line were four times as likely to have an unplanned pregnancy, five times as likely to have an unplanned birth, and more than three times as likely to have an abortion as women with income at least double the poverty line ($9,800)....