Brown Spotting turning into red blood


I noticed brown spotting about 48hrs it was light the next day it was doubled and I saw it when I wiped. Went to the ER last Night they saw an empty sac the scan said I was about 4weeks along and I’m actually 5 weeks almost six. I woke up this morning to a dime nickel sized red blood stain. I have not cramping or back pain so I’m in limbo. I had a threatened miscarriage with my daughter at about 17weeks so I’m hoping this one ends positive like that she is now 1.5 so I hope I don’t lose this baby.