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Unintended pregnancies have continued to rise among the poor and fall among the wealthy (including folks with decent birth control who don't think they can afford a child) for decades now.

This data's a little old, but makes the point:

https://www.guttmacher.org/news-release/2013/unintended-preg...

I spent some time researching this after reading your comment, not a lot admittedly. There seems to be a great deal of uncertainty around the topic but I came away with the impression the parent comment is closer to the truth than your own.

Go look at some graphs, when wealth and education go up, birth rates go down.

you need an enormous income before you have kids at the replacement rate, many multiples of the cost of their care.

in every meaningful sense the income/fertility relationship is negative.