Epidural Questions

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I’m planning on having an epidural because I know my pain tolerance is low.

-I keep reading about them “turning off the epidural” when you are ready to push. Is this true? Can you feel the pushing?

-is it always on a pump or could it wear off?

Any other tips or things you’ve experienced will be helpful as well. ☺️ I’m planning on going til about 5 or 6 cm until I get it as I definitely don’t want it to wear off!!!