Hi, I'm looking for advice on a long term, highly effective method of birth control. Basically, I'm 19, in serious monogamous relationship and plan on going to med school so I'm not looking for any children any time soon. I've been on the pill since I was 16, but since then I've had pregnancy (and I aborted for personal and medical reasons; the father is on accutane) and even now, I'm having random breakthrough bleeding after using it for 3 years.

I've read about IUD's. I think the copper one is out of the question, because I'm already have 7 day periods and don't want to risk increasing that. I've looked into hormonal ones but I thought I'd come here for a second opinion. I don't want kids for at least 5 years, up to 12, so I'm looking for a long term solution. The pill isn't cutting it for me anymore since I don't want to take any chances with missing one or getting sick (needing antibiotics and reducing the effectiveness). Anyone have any suggestions or any experience with one?