There are two different agreements here. The agreement to abort if she got pregnant, and the agreement to compensate him for child support. They are not connected in any way.There are two different responsibilities here.
We are not relieving Ana of her responsibility to the child by making Harry pay the child support.
However, if the woman doesn't restitute the loss caused to Harry, we are relieving her of the responsibility to the agreement made with Harry.
Edit: I also hope you're not going to employ the slippery slope of implicit agreement, since if you do it's also the case that Harry implicitly agreed to pay child support if she changed her mind since it's the law, and ignorance of the law is no excuse of the law.
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