Getting pregnant again....

Michele
My husband asked me when we are going to try for our 2nd LO. (Ryker is 13 weeks old). I want the kiddos close in age but geeze Louise..... Lol
Do you ladies have any experience with getting pregnant shortly after giving birth? I'm thinking 18 months to 2 years apart in age is 
My OB said that if you're breast feeding it's highly unlikely..... But my primary doc just told me I should probably be on birth control if we are not quite ready for #2 yet.  So now I'm a little confused..... I need real life advice. Lol