Where is all the water coming from?

I have been so busy this week. Nothing major going on just running errands, doing some shopping, normal stuff to keep me busy.
Today was my first day to just stay home after taking the kids to school. I needed to do some cleaning and get things picked up while the kids were at school.
Everything started off great, just cleaning away....I walked down the hallway once and the floor felt a little wet. I figured someone had forgotten to dry off before getting out of the shower or maybe a wet towel had been on the floor, I didn't think too much of it.
Kept on cleaning, walked down the hall and felt that the floor was really wet, not just damp. Hmmmm. Not wanting to KNOW what was on the carpet, I threw a towel down, stepped all over it and figured my job was done.
A little bit later I walk down the hall again and this time my foot goes, "splish, splosh"! Not a good thing to hear in the middle of your hallway.
I quickly called Jason and he told me to go ahead and pull up the carpet to see what was going on. I pulled back the carpet and found that my carpet was very wet, my padding was soaked and the cement almost had puddles! YIKES!
I got out more towels, wiped everything up and then waited. I needed to see where the water was coming from. Long story short, I now have a plumber coming to my house tomorrow. I have to keep the water turned off (with 4 kids in the house...haha!). I have to take everything out of the bathroom cabinet and have it ready to be pulled out by 8:30am tomorrow.
I have a hair appointment at 11am tomorrow so I am just going ot have to trust the plumber to do his job and leave him in the house. You don't understand, my stylist books up 6-8 weeks in advance. I can't just call and re-schedule! It would not be very good for my roots!
I am tired and I haven't even started empyting the bathroom cabinet!
Pray everything goes smoothly and that he can find the leak and get it taken care of. Pray that the homeowners insurance guy comes quickly and will pay for the damaged carpet, damaged linolium, and wood flooring!