One of the most effective ways to minimize unwanted pregnancies is to change the current mentality about children, which is not very favorable. Children are not often seen today as blessings, but rather as financial burdens, hindrances to the adult lifestyle or (insert your favorite reason children are a drag).
As a homeschooler, I am home all day, every day, with my three children, and I can't tell you how often I have had other women tell me that they could never spend all day with their own children. Why in the world would they rather be anywhere else? I think in part, this may be because of the trend in society towards extremely permissive parenting, meaning that more and more parents are raising undisciplined and bratty children. My children are certainly not perfect, but on a normal day, when my hormones are not at their nadir, they certainly do not make me want to pack up and leave home for 10 hours each day.
The media certainly doesn't enhance our view of children, especially their financial impact. Several times every year I come across some article telling people that they can expect to spend some astronomical six-figure sum to raise each child to adulthood. The problem with these figures is that they are assuming that the cost of hospital births, fancy nurseries, day cares, sports uniforms, designer clothes, extravagant christmases, college tuitions and (insert your favorite modern "need" here) are somehow inherent in the childrearing process. My oldest is 11 years old, and including her homebirth, which cost 2,000, I can honestly say we have not spent more than 7,000 (if *that*) to raise her, and that is including medical expenses, purchasing thousands of books for our homeschooling purposes, etc.
Family life itself has been all but shattered in modern times by the rise of the institutional mindset, which includes the almost universal acceptance of working mothers, government schools and extra-curricular activities. Most family members of all ages routinely spend huge amounts of time away from their homes, building relationships with peers at the expense of family closeness. The alienation between adults and their adolescents can be directly traced to the peer mentality that dominates the lives of most children today, as their most important beliefs, interests and relationships are forged outside of their homes, in schools and by popular culture.
So much more could be said on this very important topic, not least of which is that many people are once again turning away from the anti-child mentality and embracing large families and home-centered lifestyles. This change of mindset is the most important component in ending "unwanted" pregnancies.