Anyone every go to an early ultrasound and see nothing

Abbigail • active duty, married to the love of my life. Found out I miscarried July 21 & November 18.

Has anyone gone to an ultrasound at 6 and it be an empty gestational sac, no yolk sac and f/u a week or 2 later and everything look normal? I’m so scared. I had 2 miscarriages already and I’m terrified this is another. I need some positivity😭