Hello. Can you please tell me if I should be pushing after childbirth when…

Hello. Can you please tell me if I should be pushing after childbirth when the placenta comes out? I remember in my first pregnancy they said to slightly stretch, but in my second one they said not to. In the third one I don't even remember anymore. It seems like I didn't push, it came out on its own or did the doctors take it out? After the baby was born, I wasn't thinking about the placenta and all attention was on the baby.