Can you see the baby?

My last period was December 2-6. I had a positive ovulation test December 23rd. Took a pregnancy test January 4th and found out I was pregnant. I’ve been having a lot of doubt that I’m not actually pregnant.. because it took 8-9 months to finally get pregnant after a few bumps in the road. I had a incident last night and went to the ER.. and the doctor wasn’t sure if a ultrasound would show anything right now. But he decided to try and look anyways.. he used a probe that plugged into his iPhone and was looking and than he decided to try the traditional ultrasound machine.. and he assumes that this is the yolk sack and the small dot on the top right is the baby. And I’m suppose to be 7 weeks and 5 days pregnant. But this seems too small to look the size of a blueberry... am I not as far along as I think I am? I feel like there’s nothing there to look at.. 😥