I Went For A Scan Yesterday And Was Dated At

I went for a scan yesterday and was dated at 7 wks 5 days and there were 2 sacs 1 with a baby and an empty sac the empty sac measured 25mm x13mmx 11mm and she said she could see nothing in the sac so she said it was a missed miscarriage but after reading some stories not sure if this is the case.Is she right .