Expressing before birth?


I had my 37 week appointment today with my midwife and she gave me the go ahead to express my breastmilk.

Problem is I don't know if I should or not?

What benefits does it have?

Is it worth doing or should I wait?

I've heard it can make contractions worse during labour.

I have no idea whether to bother with it or wait till bubs is here. This is my first baby and my mum never expressed before birth.