So scared, 7 wk ultrasound showed only yolk sac

Chelsea

So my 7 week ultrasound today only showed a yolk sac, Dr said by my hcg numbers he expected a heartbeat. So he said it’s more likely than not a miscarriage, but if my hcg tripled from last blood draw as it should, I’m just early, if it didn’t I’m going to miscarry. I’ve had 2 miscarriages, and my last pregnancy was as bad as possible with a good outcome. I’m so scared but trying to stay positive. Anyone else had a similar experience? Talking to people makes me feel calmer.