For breastfeeding moms six weeks postpartum

Hello ladies I am six weeks postpartum and my appointment is coming up! I am exclusively breastfeeding and plan on doing so for as long as I can (I breastfed my first for 15 months) my question is what birth control did you choose? What’s best for breastfeeding moms?! I haven’t used birth control since 2014 way before I got pregnant with my first baby help!