Not sure what to expect.

Went in to the ER yesterday at 9 weeks for bleeding. I passed a few little clots too. I had an ultrasound there and knew after that something was wrong. The doctor came in later and said it was bad news. 😔 I'm having a miscarriage. There was no gestational pregnancy identified and no heartbeat. 
I have an appointment with my OB on Monday but I'm not sure what to do until then. Should my bleeding get heavier? How much pain should I expect? My heart is so broken, I just can't believe it.