Is it a Miscarriage?

Antoinette
Hello everyone, 
I have never experienced a miscarriage before and I have been having moderate bleeding and cramping. I am 7 weeks. Started spotting 4 days ago, went to the emergency room 2 days ago,and was told I had a sub chorionic hemmohage and sent home as a threatened miscarriage. I also saw the baby's heartbeat and it was normal along with everything else looked normal. The next day/last night the bleeding started heavier and this morning I'm having mild cramping pain in my back. Could this be me miscarryinh? Even if everything was fine two days ago? Could it be the hemmorhage bleeding out? I called my doctor and was told to rest until my appointment on Thursday.