When will it happen?!

A week ago I had an ultrasound which show my baby measuring 2 weeks earlier then I thought with a heart beat. I had 4 days worth of bleeding after that. This week the bleeding has stopped but my doctor wanted me to get another ultrasound. This ultrasound no growth and no heart beat. We decided to just let my body try to naturally get rid of the contents. But how long will I have to wait? Waiting is the worst part. I just want it to be done!