Adoption does not guarantee or ensure pregnancy, and it should not be used as a means to try and get pregnant. Pregnancy is a biological process, and a couple can not determine if and when they will become pregnant.
My side: Yes, everyone hears these stories. The minute they adopted, they got pregnant. Of course they did! Guess what - adopting in itself will not improve my husband's sperm. Any correlation between adopting and getting pregnant lies only in God's sick sense of humor.
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