B.
I have a Mirena IUD, which I got a few months after my daughter was born. I can't feel it at all and it seems to be working quite well. I had extremely heavy periods for the first five months or so, probably exacerbated by being post-partum. But now they are tapering off quite a bit, which is supposed to be a benefit of the Mirena. I have also had negative reactions to hormone contraceptives, but I've noticed none of them from the Mirena device. I hope this helps!