I tend to be quite impatient so I am hoping that after the first few weeks with Mirena it will all be worth it. I had Mirena placed on the 13th of this month, and was on day 6 of my period. I've been spotting and having cramps for the last 5 days. Is this normal? The doctor said I should see quite a bit of improvement in as short as one week. I am hoping so, as I am using Mirena as a way to diminish my painful and very heavy periods.