7 weeks ultrasound and just yolk sac!!!

Kira
Yesterday was my first ultrasound for my 2nd baby and shows yolk sac but no baby yet , the Doctor said I'm probably early .  The ultrasound tech told me that I'm probably 5 weeks  but according my LMP (07/04/16) I have 7 wks. He send a beta Hcg quantitative today and another in 48 hrs to see if the Hcg is getting up ( that means the pregnancy is ok) if is dropping , no baby is there.😢. 
I'm worry , nervous and anxious to know the results. I'm praying to God the all mighty that everything is good and we don't see the baby yet because I'm early.
Somebody have a similar situation before?