Nervous

After miscarrying twice this year this pregnancy has my nerves up to say the least. Got a positive pregnancy test Nov. 21st. Went to get my hormones checked on Nov. 29th my HCG was 2,664 the on Dec. 7th I went and got my first ultrasound and hormones rechecked and went up to 7,705. I went today Dec. 21st and I have progressed. Today he saw a gestational sac, yolk sac and fetal pole but no heartbeat yet. Still not sure exactly how far along I am. I also have a retroverted uterus which I guess makes things a little harder to see. Just wanting some reassurance. Or if anyone else has experienced this? 😖 Next appointment is Dec. 28th to see if anything has changed.