https://www.facebook.com/groups/731858976186540/ (here you can ask your own questions regarding EO faith)
The Orthodox Church understands marriage as a union of love in which husband and wife are called to be co-workers with God in the gift of bringing new life into the world. Because of this, the Church has traditionally taught that intentionally preventing conception is not in keeping with the Christian way of life.
In Holy Scripture, the example of Onan (Genesis 38) is understood as showing God’s disapproval when a person selfishly avoids fruitfulness. St. John Chrysostom describes the use of contraceptive methods as killing at its very beginning. In his canonical letters, St. Basil the Great equates women who use potions to prevent conception with murderers. St. Augustine also strongly condemns the deliberate avoidance of having children.
However, in modern times the issue has become more complex. Some contraceptive methods are considered abortifacient, meaning that they do not simply prevent conception but destroy a life that has already been conceived. The Church unequivocally rejects such methods as abortion. The only natural method of preventing conception that the Church may approve of is abstinence from marital relations.
As for artificial methods of contraception, the majority of the Church Fathers throughout history were clearly opposed to them. At the same time, some modern bishops and theologians, such as Metropolitan Kallistos Ware, have suggested that in certain situations pastoral oikonomia may have a role. Even then, a clear distinction must always be made between methods that destroy human life and those that merely postpone conception.
In every case, what matters most is remaining open to God’s gift of life, avoiding selfishness, and seeking the guidance of a spiritual father who can help a married couple respond faithfully to their particular circumstances.