There is obviously a difference between policy that makes it through to law and what politicians say, but it is undeniable that politicians are calling for more births, less birth control(abortion at very least), and are pursuing less sex ed than the past few decades.
As for the downturn in young unmarried women having children, that is definitely true and most people attribute that to an increase in education for women and the availability of birth control and sex ed. Which leads me back to my comment about the powers that be and what policy they prefer, or at least are saying they prefer. The SC ruling on abortion, the red state abortion laws, and several red states limiting or eliminating sex ed in schools all show that as a goal of politicians, not to mention many politicians clearly and simply stating that we need increased birthrates on camera. If they aren't optimizing specifically for birthrates, they are doing so for religion, which is adjacent, at worst, to optimizing for birthrates.