Copper
"I have had the paragard for about 6 months.  Insertion was uncomfortable but not bad.  My first period with the iud was unbearable I cramped severely for 1 day.  And I had heavy bleeding for 3days. 4 normal bleeding days.  Then I spotted till my next period on and off.  My following periods since then have not been bad.  I barely cramp.  But I do have heavier bleeding.  My periods last a week.  I thought  my periods were going to be awful and that I would have bad cramps and bleeding would be really heavy.   Before the iud my periods were 3 days and pretty light.  So maybe that's why my periods w/ Iud aren't as bad?  I also use the period cup instead of tampons cuz they give me cramps.So maybe thats why I can't complain about the iud."