Ask for some 'blueys' when in hospital (a square with plastic on one side and padding on the other). The midwife gave me some which I folded and placed under the pad to catch any leakage at the back - especially while laying down. Never had to change knickers due to 'accidents' because of these things!

Also, ask your close friends and family to bring a meal for you when visiting instead of bringing gifts for the baby. Especially in the first couple of weeks. One less thing to think about!