Belighted ovum

I had a ultrasound at 4 weeks and 5 days and 5 weeks and 5 days and they could only see the sac. They said it was too early to see the embryo and heartbeat . My question is I’m scared it will happen to me and I won’t have a baby out of this. I guess I shouldn’t of opted to have ultrasounds so early bc of this worry. My HCG at 10 DPO was 14 . A week later was 2,000 and then 1 week later is 14,000. Anyone have this happen with early ultrasounds and it turn out good for them?