It depends on you!
If you feel comfortable it should be ok. I wouldn't like to leave it if I had one.
The stretching of the skin can cause it to be easily ripped out.
I would definately advise taking it out before delivery - I just have visions of someone movin a sheet, or leaning over and riiiiiiiiiiiiiiiiiiiiiiiiiiiiiip goes the belly button.
But still it is your choice and your risk