I believe the answer is, NOT MARRIED, NO SEX!. That shouldn't be impossible in a "modern" society where humans don't consider themselves animals. The problem isn't unwanted babies among the married couples. The problem is unwanted babies among the unmarried.
Married people also get abortions for various PERSONAL reasons that aren't any of your business, nor is it any of your concern to stick your nose into their business.
The vast majority of abortions are performed on unmarried women. Are you denying this? I don't stick my nose in anyone's business unless they are creating a foul odor that I can't escape.
It's like gay marriage. Everything seems OK until the gay couple go to a baker, photographer, bed and breakfast establishment, and a minister who accepts such behavior is sinful and without social merit.
It like the guy who thinks walking around nude is natural and parents cringe at the thought of him walking around the playground.
I fully realize that there are cases where a life is sacrificed for a life. It is when people make excuses for their own behavior patterns at the expense of what is right I find selfish and unreasonable.