Embryo but no yolk sac?!

Sierra

Hi ladies!! My OB office sent me into the ER to get levels checked due to some cramping and back pain yesterday morning. I’ve had 4 MC so they just wanted to make sure everything was okay with my hcg. They did an early ultrasound and blood work! My levels have doubled from Friday and they say that’s good! Not worried about being 1 week less than estimated because I know I ovulated late this month BUT then I read the ultrasound report ⬇️⬇️

Trying my best not to worry and thinking maybe they just couldn’t see the yolk sac just yet?? Any helpful words would be greatly appreciated.