empty sac blighted ovum?

mother
This has been a rollercoaster of emotions from the start. I had my first ultrasound for dating today. Gestational sac was seen measuring 6 weeks. I thought I was 7 weeks 5 days. No fetal pole or yolk sac seen. I had a bleed that lasted for 4 days when I thought I was 5 weeks. But levels were rising appropriately and more than doubling every 48 hrs. I was wondering if anyone else had a scan so early, and if you had a blighted ovum (empty sac) scare and your baby was possibly seen later around 8-10 weeks? I'm very worried. Had a chemical pregnancy in march as well. Got pregnant right away after and now possible blighted ovum! Jesus please let me have this baby.