The pro-life side of the Catholic Church is in favor of what they refer to as prenatal adoption, that is, adopting another couple's unused embryos from IVF.
Each year, over 600,000 embryos are thrown away only in the United States, so embryo adoption is a very valid option for Catholic families who suffer from infertility and wish to build their family through an alternative method.
In this sense, there exist various associations such as "Snowflakes Embryo Adoption and Donation", created by Nightlight Christian Adoptions, which pioneered embryo adoption in 1997. More than 480 babies have been born ever since.
For more information, please visit the following post: Religious views on gamete donation and embryo adoption.