Praying hard that all is okay

Hi mummies, not sure if anyone had experienced this before.. I've had mild bleeding (fresh blood with few teeny weeny clots) at Week 5 and after a scan at KKH O&g, ultrasound showed presence of gestational sac and even yolk sac. A 2nd opinion was sought at private gynae the next day, however ultrasound showed an empty uterus.. Has anyone encountered this before? What is likely to have happened? I'm really saddened and anxious. Private gynae had advised to go back to Kkh for a confirmation scan. Really frightened to see or hear the hard truth. #1stimemom