My 4 year old has been asking…

What her cervical mucus is. I told her it’s normal and that I forgot the name lol. But I honestly was afraid to tell her the wrong thing bc she’s gonna talk about it to everyone since she learned something new. How do I age appropriately tell her what it is? And do I tell her somehow she shouldn’t be openly talking about that to everyone? She is autistic but it might not be obvious to many that she is