Help :(

I had to take a trip to my local accident and emergency last night, I'm almost 12 weeks pregnant and I started to get heavy bleeding in the shower, I screamed for my husband to take me to the hospital. 
I spent 4 hours in the hospital with heavy bleeding and cramping and they can't give me an ultrasound until Monday so I was sent home.
I am terrified I've lost the baby and I was wondering if anyone else has been through this as I just don't know what to do :(