For some adolescents, pregnancy and childbirth are planned and wanted, but for many they are not. Adolescent pregnancies are more likely in poor, uneducated and rural communities. In some countries, becoming pregnant outside marriage is not uncommon. By contrast, some girls may face social pressure to marry and, once married, to have children. More than 30% of girls in low- and middle-income countries marry before they are 18; around 14% before they are 15.