I can understand in some parts of the world people have to mature faster, and the age of 14 is considered an adult. My grandma had her first kid at age 16 in an arranged marriage. The child was planned, and provided for in terms of shelter, resources, schooling, food, etc. Her schooling finished at the age of 9 (she can't read or write only learned household chore) and to that extent, as soon as her education was complete, she was seen as an adult and fit to be married off.
However, in western cultures, we would generally consider 14 to still be a child. Maturity levels of course vary from person to person, but most expect their pre-teens to still be innocent and dependents themselves. I don't meet too many 14-year olds who are financially secure, have a place of their own, have finished high school, and are in a loving long-term relationship with the father. To base a pregnancy on being "fashionable" instead of wanting a child to love and treasure, that speaks volumes about the immaturity level.