Feeling nervous 😥

Actually I am 8week and few days but when I go to doctor appointment and she say baby is measuring 6week 3 or 4days something and don’t find heart bet yet. And she told me come next week to see agine . I am feeling so nervous and I was praying god not to take my baby this time . Hope next week I can see baby heart bit .

Did anyone have same experience? Plz share me . I have to worry? Or it’s normal baby measuring 2week smaller? I don’t know why baby is measuring 6week 4day as I was aspating 8week . Because my last period start 20/03/2020 . And I so ovulating between 2/04/2020 till 5/04/2020 .

Plz share me experience. I am worried