You would think (as I did) that after having a 7 pound baby naturally, that having a teeny tiny device placed in my uterus would be like a slap on the wrist. Well, it was like being slapped on the wrist with an electrifying cat-of-nine-tails.
It turns out my uterus was tilted toward my back so they couldn't get it to measure the required measurement. I laid on the table for nearly 30 minutes while they poked and prodded and I cramped and cringed. I was SO CLOSE to saying, "Nevermind. Just write me a prescription for oral contraceptives!" It was really painful. Finally, they got another doctor, and he got it in - THAT WAS A DOOZIE. Afterwards, I sat up and felt lightheaded, so they made me lie back down and eat some crackers and juice. So then I had to lay there 15 more minutes.
I felt crampy and terrible for a few hours. Currently, I'm doing okay . . . but that could be because I overdosed on Ibuprofen. I plan on staying "doped up".
At least with childbirth, I was distracted by a million things (and I had adrenaline on my side).