I keep saying motive, motive, motive.
Most pills are abortifacients, and cause an early abortion.
When practiced properly (and it's not any more complicated than remembering to take a pill at the same time every day), NFP is MORE EFFECTIVE than any other form of birth control WITHOUT the side effects.
Refraining from sex in a marriage in order to avoid pregnancy (for spacing or financial reasons, for example) brings the spouses closer together. Couples who practice NFP have a lower divorce rate than couples who use artificial birth control.
More to come later, my little monster :-) is wrecking havoc in the house!