Yolk but no baby

I went for an early pregnancy ultrasound for the second time today, after not seeing yolk last week and now there is yolk.

The bad news are that there’s no baby.

She said that it might be too early. I’m 6W2d but my gestational sac fits to 5w2d.

I’m super scared, I had a miscarriage last year and I really want this baby.

Anyone had a similar problem?