There is no difference between NFPand contraception.
NFP methods are different from and better than contraception.
have no harmful side effects
are environmentally friendly
are virtually cost free
cooperate with, rather than suppress, a couple's fertility
can be used both to achieve and avoid pregnancy
call for shared responsibility and cooperation by husband and wife
require mutual communication
foster respect for and acceptance of the total person
encourage maturity and the virtue of chastity
value the child
honor and safeguard the unitive and procreative meanings of married love.
In other words, there is a big difference between NFP and contraception. NFP, as opposed to contraception, does not deliberately frustrate the procreative potential of sex. So, NFP is morally acceptable while contraception is actually sinful and never morally right. NFP is unique because it enables its users to work with the body rather than against it. Fertility is viewed as a gift and reality to live, not a problem to be solved. Ultimately, NFP respects God's design for married love.