I don’t equate contraceptive measures with infanticide because there was no conception, hence no baby to abort. This is a preventive act to prevent overpopulation of the species.
Contraception is taking reproduction out of God's hands and placing reproduction in the hands of man.
Greed will bring about an end before overpopulation does anyway!
Contraception and abortion are different sins.
Contraception — the kind that prevents conception rather than kills the embryo — is a sin because it introduces human will contrary to the will of God. It is a sin against the First Commandment. It is akin to the sin of blasphemy. Since it does not hurt anyone other than the people voluntarily engaging in it, it is not considered a crime.
Abortion is the sin of murder, a violation of the commandment not to kill other than in defense of life. It does not matter if the abortion is chemical or surgical, on what stage of the development of the baby it is committed, or what are the reasons the “mother” chooses to commit it. It is not merely a sin but also a crime, albeit our society happens to not recognize it.
You didn’t ask, but there also is the sin of self-mutilation, inherent in vasectomy and tubal ligation.