Freezing your eggs used to be an out-there procedure deemed “experimental” because of its iffy odds. But thanks to better success rates—and major media buzz from celebrities like Olivia Munn, Maria Menounos, and Jennifer Love Hewitt—it’s become an empowering way to buy time to have a baby on your own terms. More fertility clinics are offering it, and tech giants like Google and Facebook are covering it in their benefits packages.