Possible Missed Miscarriage

My wife went for her second ultrasound check today. 2 weeks ago the doctor was able to see heartbeat after doing the virginal scan, estimated 6 weeks pregnant. Today the scan was done by the radiologist and no heartbeat was heard, was told baby doesn't seem like growing. Doctor mentioned that it might be a miscarriage and ask us to go back for another scan in a week. Anyone encounter this before and baby is ok? We were crying the entire afternoon as it is our first pregnancy after almost 4 years.