Birth control while EBF?

So I haven't had my PP check up yet so I haven't had the chance to ask my OB about it, but I'm curious about getting on the pill and the effects that it will have on my supply. My husband and I have practiced the "pull out" method for seven years before we decided to try for a baby and it always worked for us. I'm just paranoid now because it only took us one try to get pregnant, and now I can't help but think he's super fertile and if we were to continue having sex that way then we could get pregnant very quickly again. So I want to try and get on BC but wanted advice from anyone who has been on it and also breastfed their baby without any side effects.