What does this show?

Dinah

I went to get my first ultrasound on Friday. According to the calculations of using the first day of your last period, I'm about 7 weeks (3/17/19) but as the Dr. was looking at the ultrasound, he said he didn't see anything resembling 7 weeks, which obviously made me nervous. Then I started thinking and I'm pretty sure our conception date was 3/28/19 which would make me about 4 weeks? Either way, he said he didn't see anything in there and now I'm panicking. However, the more I look at this picture, the more I see two white marks- could that mean identical twins? Does anyone else see this? I got blood drawn on Friday and I'm going again on Monday and we're going to see if I'm still pregnant based on comparing my hormone levels but id like to get some reassurance from anyone thats gone through something similar...