6.5 weeks and only a yolk sack

We went in for a transvaginal ultrasound thinking I was 8 weeks. My last period was oct 22. I got my first positive a week after my period was due (nov 22) and it was very faint. My cycles are sometimes longer than 28 days it’s caries.

The transvaginal ultrasound only showed a yolk sack... and the OB let me know I was only measured at 6.5 weeks.

She told me I may have ovulated later but prepared me to keep in mind I may have miscarries or it was a non viable pregnancy...

I go back next week for a follow up ultrasound and I am just not feeling hopeful