I just got the Mirena IUD little over a month ago. The initial pain is a bit much. Definitely take some motrin either before you go or right afterwards. I didn't have any cramping throughout the day luckily. I actually went right back to work after the procedure. My biggest problem is that I'm having my 1st period since having the IUD put in, and it is extremly heavy & long. At first it was light for a few days, but after about a week and half it had gotten extremly heavy. I think I'm just over 2 weeks on my period. A good friend just had one put in this week....I had her ask the Dr. about the heavy and long period. The Dr. said it was normal just the body thinning out the lining in the uterus. Each person is a different, so I think it will affect them differently. I'm really interested in hearing more reponses on this.