In fact, given demographic pressures in much of the developed world (and some middle income countries), it would make sense for those countries to be much more welcoming of migrants and refugees to improve their demographic balance while simultaneously reducing population pressures in the developing world. Perhaps that is a rather more ethical and effective solution rather than 'preventing pregnancies'.
Faith is Hope (see Loki's sig for details)
If hindsight is 20-20, why is it so often ignored?