I had Mirena inserted 6 weeks after I had twins via c-section. I still had post-partum bleeding at time of insertion & bled/spotted for about four months after insertion. My doctor said it was normal & gave me some oral bc to help stop bleeding. Since it stopped, I've had very light, regular periods & minor cramping. Earlier this month I had a very light period. I had sex after my period, & the very next day I had heavy, period-like bleeding that lasted for a week. I am currently 5 days late for my period & had all my usual PMS symptoms. Now I am still bloated, tired, hungry, & have back pain & pelvic cramps. In addition to having the IUD, I also take 30mg of Adderall XR for my ADD & have taken it for three years (except during my pregnancy). It has not been effective for the past two days, which is something I have never experienced. Could I be pregnant? Is this a normal side-effect of the IUD?