The Pilgrims who founded our country considered B.C. as bad as adultery and disqualified anyone from church leadership who practiced it. All forms of B.C. increase abortion. Using B.C methods causes a woman to undergo uncomfortable periods every month, but going without B.C., periods can be rare. The pill can also cause permanent infertility and a host of other major and minor problems. The IUD often causes lacerations in the uterus which result in severe pain and permanent infertility.
Abortion is a serious cause of breast cancer.
It is also a proven fact that the longer child-bearing is delayed, the more likely a woman is to get endometriosis. Overpopulation is a local problem in some cities, but it is not a world crisis. It is also a fact that humans adapt and create new methods of coping with scarce resources. The scary, high figures you see quoted are based on expensive C-sections, baby formula, baby food, frivolous baby furniture, not getting a baby shower, using day care, etc, all of which is unnecessary. It doesn't take long before children are old enough to become income producers, anyway.