I've been contemplating my BC options as I sit a week past my due date with my second child. I am thinking of going the IUD route, although thinking copper versus the Mirena. It is supposed to last for longer (10 years), and does not have any hormones released. (My understanding is you still have periods, too) I also am against hormonal altering, because, even though I don't like having a period, I'm supposed to have one for a reason. Ya know?
Do your homework on this, there are a lot of options out there, each come with risks, or side effects, or just plain inconveniences.