R.H.
I have the Mirena as well. I did not hear a click noise during insertion, but I did feel the overwhelming pressure and cramping during the procedure, but I had mine done 7 weeks after having my son. If you had the procedure done during or just after a menstrual cycle, then you may not have felt the pressure and pain. My doctor told me that I was going to feel the pain and pressure for 2 reasons: 1) I had just given birth and my insides were still tender and swollen and 2) The pressure was him having to go in and physically open my uterus up to insert the IUC, where as a woman on her cycle would already have the uterus at least slightly open. My doctor also told me that the best way to check for proper insertion is to feel for the strings, they are unmistakable, you will definitley know them when you feel them. Find the strings and follow them up the cavity and make sure that you do not feel the other end but rather the opening to your uterus, and also give a very gentle tug on the strings. If the IUC is in place then when you do the gentle tug it will give a little, but then go right back to where the strings were. Hopefully this helps and I hope that it was inserted correctly and you were just lucky enough to not feel the pain. As I said before, I had given birth 7 weeks prior and when the IUC was inserted, I broke out in a cold sweat and almost starting crying because of the pressure, it wasn't a pleasant feeling.