vaginapagina | Embarrassing question, can't ask anyone IRL.

Hello, I'm a 24 year old woman from North Europe. When I masturbate, I like to enter my vagina and poke or rub my cervix/uterus with one finger the moment I come, also rubbing over the little hole a bit. Is this bad for you? I started doing it one day and it feels so satisfying to do.

I don't know who IRL to ask if something like that is harmful. Thanks for helping.