Fertility companies and patients have been moving embryos and making contingency plans, anticipating that if Roe v. Wade were overturned, abortion laws in some states could extend to protect eggs fertilized in laboratories.

More than 2% of 3.7 million babies born in the U.S. in 2019 were conceived through in vitro fertilization, the latest federal data show. Many embryos created through IVF aren’t viable, fertility specialists said, and those that aren’t ultimately transferred into a uterus may be discarded.