I suspect you are correct. But from a practical point of view of getting out of poverty, I don’t think it really matters. There is a poverty cycle, where being poor increases the likelihood of teen pregnancy, which in turn greatly increases the likelihood of ending up poor. To get out of poverty, one has to break the cycle.
A teenage girl can’t do much about being born poor. What she has some control over is having risky sex. Not saying it is easy or fair. Just saying it is within her power to at least attempt to get out of the poverty cycle.
It would help if there was a change in culture where such behavior is not so easily condoned. Don’t want to return to the days when pregnant teens were stigmatized and ostracized. But teen pregnancy shouldn’t be so easily accepted that it is painless for boys to walk away and for girls to use it as a distraction from boredom/hopelessness/depression. On second thought, it may not be a bad thing for boys to be stigmatized if they abandon a pregnant girl.
In any case, I don’t see a problem in making it clear that such behavior, regardless of the mitigating factors like poverty, is still irresponsible and self-destructive.