I had the depo shot and I was actually informed that with extended use they can cause you to become infertile. Plus after I got off of it it too me over 2 years to get pregnant again. I've heard really good things about implanon. I'm going to do the mini pill simply because it seems like the least risky option to me. As long as you take it as directed.
Go to planned parenthood website and look at the birth control. They have a list of all the birth controls the effectiveness and pros and cons. It helped me decide that condoms and the pill is best for me.