Baby development

I’m 11 weeks and 2 days and am wondering when you mamas started playing music and things to stimulate baby? I constantly listen to music and sing and talk to baby even though I’m unsure if they can hear it. I use the vibrations from the music against my belly so they can feel rather than hear. Do you think it’s working in a sense? I know it’s worth it anyway and will continue I just want to know some other mamas knowledge.