It's UNMARRIED teenage pregnancies that are the target, not MARRIED. I notice that a number of posters here have difficulty grasping the difference between sex within marriage and sex outside marriage.
God is not subject to the laws He made for humans. When Eve was given to Adam, she was not asked if she wanted to have sex with this man she had just met. Adam did let her run around loose, getting into trouble with the lawyer/serpent, listening to his bad (but free!) legal advice. It was not until they had been evicted that Adam had sex with Eve, and still no mention of her consent. Guess he was bigger and stronger than she? Maybe she did consent?
In former times, a woman did not have to c0nsent to be married to some fellow. Her father sold her to a man he thought would make a good son-in-law and father of his grandchildren. Genesis 24:53 The man, now her husband, "took" her and had sex with her whether she consented or not. A woman could be whipped (not supposed to be hard enough to scar or injure her) for refusing to have sex with her husband. We've come at least a little way from then.