What makes you think the baby will come early?

I keep reading posts about the doctor saying the baby will come early or moms having the feeling he will come early. “Doctor says baby will come at 37 weeks” type of comments. What would make you predict a baby would come early? I’m just curious because so many people keep telling me they predict my boy will come early but I do not know why. I’m so ready but also worried I won’t be prepared if he is early so I would love to know what signs you look for. Thanks in advance!