The key element to an effective jade-egg practice is inserting your egg the right way.
Never just push your egg up your vagina and do your practice. That way it will only add more stress and trauma to your yoni.
Ask your body if it is ready and want to receive the egg. Listen to your body and slowly allow your body to open up.
By relaxing and breathing, and consciously opening and relaxing the muscles of your vagina opening.