Spotting and no heartbeat

Hey mummies to be, based on my cycle I was supposed to be week 8 last Sunday. I went for scan on last Saturday and it was detected as week 6.3 days. It wasn’t a vaginal scan and slightly blurry. I had spotting this week and I went for another scan today. The size only grew to 6.4 days and there is T heartbeat. Dr was saying it is likely to be a miscarriage but I’m going to do another scan next Saturday just to be sure. Anyone experienced the same?