baby dropped at 31wks?

B
How soon is too soon for the baby to "drop?" I'm 31wks1d and noticed she is lower and have been told by everyone I've seen today that she "dropped". I was having some contractions Tuesday night I wasn't sure at the time if they were BH because I've never had any before. They were pretty painful. I'm just wondering if this means I'll be at risk of going to labor early? I have an ultrasound Monday just wondering everyone else's experiences.