After a few days, maybe a week, bowel movements will stop altogether :-)
It feels really weird not to be eating or going to the loo when everyone else is, sometimes I feel like a ghost! Then afterwards, when I eat I think "gosh, this method of supplying us with energy is sooo crude and messy", LOL!
Oh and don't forget, you WILL put some weight on after a fast, but it is a fixed amount and it will eventually stop. See my recent posts to bella lucia for more info.