Definitely pack for the hospital now just because that should be done weeks ahead when you can think calmly and not be in a hurry. If your intuition is correct and your baby comes earlier than his due date, you just take the packed suitcase with the camera, extra batteries, extra film and/or memory card and call list inside.... and go!
As I was told......and this applies to day or night......
If the contractions or back discomfort you're feeling are painful or increasingly painful, do call your doctor.
If the contractions are happening at regular intervals (time them), call your doctor.
If the contractions are more than 6 in an hour, call your doctor whether they're regular or not.
If your start running a fever or your water starts leaking or breaks, call your doctor.
If your water is leaking or has broken and almost 20 hours has passed since the leak started or your water broke, go to Labor and Delivery whether you're in labor or not.
If you start bleeding, go to the ER at the hospital where you plan to deliver or to Labor and Delivery. They'll call your doctor!
I thought those were good instructions!
Wishing you well! Barbara