The right BC for me.

I recently made the decision to stop taking my birth control pills after 5 years of taking them. I was hoping to get off more meds and possibly lose weight. Since stopping the pill, I've lost a ton of weight which is great, however, my periods are awful and my bf (and I) prefer sex with condoms. The last this I want is to get pregnant but I'm worried about gaining the weight back if I start birth control again. Does anyone have a suggestion as to what form of bc I should look into?