This is not correct. Though it's rare for it to happen, children as young as 10 can become pregnant. In conversation with Live Science, Dr. Melissa Simon, a professor and obstetrician-gynecologist at the Northwestern University Feinberg School of Medicine in Chicago, emphasized that "pregnancy is possible from the start of ovulation, meaning the point at which the ovaries begin releasing mature eggs," and that "you can start ovulating before you start having your first period".
The BBC reported on a pregnant 10-year-old in Paraguay in 2015, and ABC ran a story on a Colombian 10-year-old a few years prior. More recently, in 2022, sources like Politico and The Columbus Dispatch reported that a ten-year-old Ohio rape victim crossed state lines to seek abortion care.