labor

I'm a FTM. So I read up on things obviously but still feel like I have no clue about anything. Anyways I'm due in a about 4 weeks. I had my doctors appointment yesterday and I'm 2cm dilated 70% effaced. So what's it like going into labor? How do you really know? Like what were your signs you were about to go into labor and how did everything happen? I know everyone is different, just want to get some more insight on everything!