Some great advice here already.

The thing that took me by surprise, I was back in my room after it was all over and a midwife asked me if I farted. I was like wtf!? Turns out that is a sign that your bowels are working properly and they like you to fart before you eat anything.

Definitely go for cereal and fruit for breakfast. Prunes are good, but metamucil did wonders for me in the end.