I’m pretty sure contraceptives have a lot to do with that.
I really think the Catholic position is much too tough here: don’t use condoms, don’t use the pill-- abstain, or have a baby whether you’re ready or not. To me, this places far too much moral burden on a young woman, especially if she’s unintelligent or uneducated, and lives in a culture where sex at a young age is the norm.
It’s easy for older, richer, mainly white Catholics to hold a high moral position. If my own daughter, who’s now in middle school, were pregnant, I could back her up-- take care of the baby while she continued school, possibly even raise it as my own. I’d be upset by her poor life decision, but overall the baby would find a warm and receptive household.
But in many cases, a forced pregnancy will involve a baby born into truly abject poverty, both financial and moral. It will be malnourished, surrounded by violence and drugs, and have a nearly 100% chance of involvement in a life of crime-- and another early pregnancy.
As a non-Catholic, I have to say that a very early-term abortion (like say a morning-after pill or a procedure within the first couple of months) seems infinitely preferable to this.