I was having severe left side pain at 5w3d so I went to the ER. The nurse said that everything was in the right place. However my sac was empty & measuring 11.2mm. I know when an empty sac reaches 12mm it is diagnosed as a blighted ovum. I had no yolk sac or fetal pole. And she said the measurement suggested I was 5w6d (although after some research, that only measures 5w4d).  I have another ultrasound on Wednesday I'll be 7 weeks & im just so worried.