My first ultrasound was 5 weeks, 4 days, and the dr couldn't find any fetal pole or yolk sac. I now have a healthy 3 month old! Try not to stress out too much yet :)
My 8 week ultrasound looked like i tiny sac with a itty bitty baby, now im 21 weeks and shes very active and looks like a baby... so its very normal. Good luck!
Yes it's okay, I went for a early scan at 4w4d and only sac. Went back two weeks later and saw the baby, only size of a teeny grape, good luck
Thats normal when i was 4 weeks it was too early for them to see the baby so i wouldnt worry much by time you have your next ultrasound they should see everything. Also talk to your OB GYN so you dont worry yourself. Best wishes!