What's the chance I wont see the yolk sac at 5w3d?

ho

Betas went from 44 at 13 dpo, 176 at 15 dpo, and 1479 at 20 dpo. Dr said he could get me in Friday for an ultrasound, I'll be 5w3d. I had a blighted ovum in Aug which is why hes getting me in so early, but now I'm really anxious I wont see anything yet and will freak out. Trying to prepare myself for what I may or may not see