Copper IUD

Hi everyone! I’m hoping I could get your help in making a decision regarding birth control. I’m planning on getting the copper iud and am 22 years old. I am sexually active with a regular partner and don’t have any kids yet but we plan on having them in the future. I don’t know anyone who has used it before. It would be great if you could share your experiences with the copper iud. Did you gain weight? Painful? Certain brand? Thanks so much!!!