Waiting is always hard!! I remember with my first two (DD &DS), I was so uncomfortable and anxious... I couldn't sleep. I spenting the last few nights rocking in the rocking chair in the baby's room. During the day I was taking nice long baths, I felt more comfortable in the tub.
Just remember this is your last time to do anything alone!. 
You will never be able to be so selfish again. After the baby if born you can "get away", by hiring a babysitter, but your mind will ALWAYS be on the baby. So take a long bath, paint your nails, do your hair, read a book & most importantly...take a nap. Anything that you love to do! I told this to my sister and she didn't believe me. A few weeks after her baby was born, she called to tell me she should have listened. Make sure you enjoy every moment, it all goes so fast!