Birth control methods after delivery ?

Mrs • Here to meet new moms
Okay I have a few questions. 
What is the best method of birth control after pregnancy? 
If I wanted to get off the birth control would it take longer to get pregnant? 
Have any of you women had problems conceiving after getting off your birth control methods? 
I don't want to get pregnant back to back! Not that I am against it, I have a son he's 3 and I'm currently with child now. I just want to enjoy my baby for at least 3 years. I know some women who have 5 to 10 year gaps in between their children.