What are my birth control alternatives?

I'm currently on Depo-Provera. I've been on it for 3 years now, and I'm concerned about the long-term side effects I've heard about like bone density loss and trouble conceiving after you stop getting the injections. I need a longer term solution as I don't want to get pregnant anytime in the next 3 years at least. I'm too forgetful for something like the pill or the patch-that's how my youngest son was conceived. I need to know what my alternatives are so I can discuss them with my doctor.