Good Morning!! In June I had a missed miscarriage(empty sac). After that I did not get my period. On Sept 26 I had negative pregnancy test and Oct 6 positive pregnancy test. Yesterday 3rd November(4 weeks since I found out I was pregnant) I had a vaginal scan. Sac and embryo(measures 6mm) were there but no heart beat. He said I might be 6 weeks pregnant. Doctor asked me come for another scan next week.. According to dates of positive pregnancy test, I should be 8-9 weeks by now and should see heart beat.. But that not happened.. Is it a viable pregnancy?