What are the percentages of a baby forming once the yolk sac formed at 5.5 week ultra sound ?

I’m nervous as I went to er at 5 week - day and had a gas sac and nothing else the. Went at 5 week 6 days and had the yolk sac smaller says new and super early one then I go in week from then to see baby what are the percentages of baby forming ? Never had a miss before and don’t smoke or drink etc healthy and great blood high levels had those at er . I know some times they don’t but I want to know is percentage pretty high as no it isn’t a blighted as that is when NO YOLK forms to be empty as my dad is a nurse so I need help and can’t ask any one else 

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