If you have medical evidence that usage of contraceptives causes women to get pregnant at a higher rate than they would if using nothing at all, please provide it. The FDA does not allow drugs or devices to be called "contraceptives" unless they can be shown in clinical studies to effectively prevent pregnancy.
Whenever I see someone trot out that tired old trope that using contraceptives somehow leads to abortion--despite the reams of evidence otherwise--I get the idea that the person saying that doesn't care about human life so much as they want to impose a certain restrictive way of life on everyone. Sorry, but there is little evidence that men and women will ever stop engaging in intercourse, or remain celibate except when trying to conceive.
Humanae Vitae is one of the most important encyclicals to read in this regard. Had everyone listened up when it was written (me included!), there would be less abortion in this world, and more love between husband and wife. http://www.vatican.va/holy_father/paul_vi/encyclicals/documents/hf_p-vi_enc_25071968_humanae-vitae_en.html