I stand for marriage before pregnancy, because I'm a Christian and the holy bible say bed undefined meaning man and woman will not have sex during the courtship or get pregnant before marriage.
Let us keep Christianity aside first. Forcing a child on a woman whom you have not marry her is not an ideal way to start a family. Medically, there are recommend test for people with interest to get marred to check their fertility status before they move on to the next stage of getting married. Sometimes, the fault comes from the man not even the woman, so if she did not get pregnant he might think she is not fertile when he is the one who is impotent. Medical test proves and solve this all.