My mirena insertion wasnt pleasant either. The dr had to insert it twice since the iud didnt seat properly the first time. Felt like a really bad cramp and my cervix was painful for a day or two.
My first iud was inserted 4 months postpartum and I didnt feel a thing. Not so lucky the second time. And I even took advil before.
Good luck with the iud. Hope you have great success like i have.
Day 2 is much better. Very little pain. I'm not surprised the insertion hurt because I've never had a baby, therefore never had my cervical dilated. Hopefully I don't have any issues with it. The hormone is the same one I've been taking for over a year via oral contraceptive.

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