From what I've seen in recent years, there are some factors that contribute to this problem. In this area, for example:
a) it is not considered negative.
b) adoption is not presented as an option.
c) "parenting' isn't a verb." meaning they get the "benefits" of having the babies without the everyday hands-on responsibilities.
I think if there's to be any reduction in teenage pregnancies, these points need to be addressed and reversed.
I'll add- in this area, anyway- these "approaches" are not the faults of teens- it's what they're getting from the older generations.