Scan trigger warning maybe?

I went for an ultrasound I was supposed to be 6 weeks 1 day. They saw a yolk sack and said the sack itself was measuring 6w2d. There was the beginnings of a fetal pole developing. So the ultrasound tech says I bet if you came in in 3 days for a scan there would be a heartbeat and fetal pole. But the doctor didnt seem so optimistic. She said she thinks its 50/50 chance of being viable or ending in miscarriage. So they checked my hcg levels again (I had a good rise about 1.5 weeks ago). My progesterone was low at 12 so I have being using supplements. I go back for another ultrasound August 2nd. I was supposed to go back next week but they were booked (I understand but super annoying).