IUD questions lol

I’m going over birth control options, I was on the patch but it’s only 91% effective while the IUD is over 99% effective. I have a 3 month old and not looking to have another right now. lol

Does the IUD cause any pain? Does the insertion hurt? What side effects did you get with the IUD? Does your SO feel the strings? 😂 Has it ever fallen out?