I am 19 I just had mirena inserted over a month ago, I have never had a child and I bled for 7 days when my period began which was very unusual and I have not spotted at all the rest of the month like I expected. I have had no problems or discomfort with the iud. I have been keeping track of my cycle and according to my predictor I should have started today based on when I started last month. Does the fact that I bled 7days affect the start date of the cycle the next month? I am used to have a light cycle usually only lasting 3days.