7w5d.. yolk sac?

Audumn

So when I got my ultrasound, I didn’t think anything looked suspicious and the technician didn’t say anything. I heard the baby’s heartbeat and everything was good. I got home and compared it to my first baby’s ultrasound at 7 weeks, and the yolk sac looks completely different. It’s bigger and not round. Is this normal? I sent it to my mother in law, mom, sister, and best friend. They all asked, “Is there just one?”.. opinions please!