Mirena
"I've had Mirena for about six months now. I had it inserted six weeks after I had my baby and it was not painful at all. The doctor explained I would have a light period the majority of the month for the first three months and then it would go to normal. I had my period three weeks out of the month very very light for approx four months. Yes it was annoying. The past two months it went back to normal. I eat clean and exercise daily I have lost about 20lbs. I do get bad cramping once in awhile in that region especially if I lay in certain positions for a long period of time. But that could just be post pregnancy.  I'm overall a happy calm person and my mood hasn't changed one bit since I started. Overall I recommend Mirena."