Waiting for Natural Miscarriage- What to expect?

According to my last menstrual period, my pregnancy was about 11.5 weeks along. We went in to the dr feb 4th for our first prenatal check up, couldnt find a heartbeat. So they sent us down for an ultrasound. The tech said everything was measuring at 9.5 weeks, no heartbeat and we actually could not see a baby. The tech said the baby could be behind the placenta. The dr sent me home, said it could take awhile and to call when bleeding begins. Basically I dont know what to expect as far as a natural miscarriage goes bc i dont know if it's possible that a baby couldnt ever really begin to develop but the amniotic sac and placenta can? Today while eating out i felt extra wet down there so i went to the bathroom to check, there was an oily off white/tannish color of liquid in my underwear. This is not my first pregnancy so I smelled it and it definitely smelled like amniotic fluid. Im almost positive that my "water broke" but still no bleeding and not much cramping or pain. Will i pass tissue as if there was a baby in there, is it possible to just pass the amniotic sac and placenta like a baby never developed? I have no idea what to expect here and on top of that I have to work tomorrow and Im not sure if its wise to work when I know a miscarriage is pending and in the very near future.