Getting pregnant after first baby

Hey y’all. I’m currently 15 weeks postpartum from c-section with my first. I already am planning on getting pregnant again possibly in the fall. Does this sound too early?? Anyone do this and have little ones close in age? My doctor gave me no restrictions. What’s the soonest you’ve gotten pregnant post baby?

Edit: my doctor said I don’t need to wait to get pregnant. Any reasons why people say you need to wait? Curious, thanks