This is so hard

I had my first appt last Monday. Went in thinking I was 8 wks and my dr could only see the yolk sac and fetal pole so he estimated somewhere around 5-6 wks. He had me back today and could still only see the fetal pole and sac but no heartbeat yet. He was able to measure crown to rump but I'm still so scared. He is having me back next week again to see if things have progressed and if not then bad news. It's so hard not knowing if my baby is going to make it :(