I Was Taking The Birth Control Depo-Provera And Became Pregnant

I was taking the birth control Depo-Provera and became pregnant in September. It was determined that I had an ectopic pregnancy. This was my second time being pregnant in 9 months (I became pregnant in January while on no birth control and had an elective abortion). Now, my Depo-Provera is about to run out and I want to find a better birth control, because it seems I am very fertile. I am only 19 and still want to have kids in the future, just not yet. What do you suggest?