Usually expressing colostrum before birth is only done when there is a known risk of early labour or other complication. However if you are leaking it anyway, saving some wouldn't hurt. You won't need much though - even 5mls is a big feed in the first couple of days!

Got to say - I don't miss the poo-splosions. I think my worst poo story was when DS2 was a few months old. We had borrowed a bassinet from a work colleague/friend, but he'd move to London since, and we were returning the bassinet to his sister. His parents were there when we dropped it back, and his mum wanted to hold the baby. Unfortunately he chose to do a huge messy poo while he was on her lap - all over him and her - I was so embarrassed.