IUD SIDE EFFECTS????

I've read on how after a lot of ladies have gotten the copper IUD put In, they have experienced alooooooot of cramping and spotting. I want to get it but if I have excruciating cramps and a tar coochie 24/7 is it worth having it put in? I'd understand if this would last a couple of weeks but I've read a lot have it for months! Can Anyone with the implant tell me how painful it is to have it put in? Thanks!! XOXOXOX