This is a musical tampon called Babypod

Babypod is a small speaker that pregnant women can insert into their vaginas to play music for their unborn little ones. Developed in Spain, it was through research that studies showed that musical vibrations increase the chances that the sperm fertilizes the egg, meaning that music helped the IV process. Having found better results in IV fertilization through musical vibrations for embryos, the researchers decided to apply their idea to babies. And the Babypod was born.