I have had the copper IUD in now for 3 years. No cramping really other than normal period cramping. It did hurt having it put in but only for a few hours after. I would suggest taking some ibuprofen beforehand. Never been pregnant...periods are heavier, especially during first year but they lighten up a little. I used to have my period for 4 days on the pill now it's more like 6 to 7 with 3 to 4 days heavier in the middle. I like it so far. No hormones, so less risks to my health I believe.