Empty sac on transvaginal u/s

RR • Together since 2009 | Married since 2014 | 3 M/C`s | MTHFR | Rainbow baby born 07/02/17💗 #2 Due 12/21/20!!
Had an early scan due to spotting. Scan dated me 5 weeks 5 days which is only one day ahead of where I thought I was. HCG was 6793 but there was only a gestational sac measuring 0.88cm (8.8mm) no fetal pole and no yolk sac. 
Have to go back on 11/9 for a follow up scan. Anyone ever go through this? 

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