I had a sono at 7 weeks 1 day. The sono tech said that it was baby and yolk sac. But I can't help but to wonder if it's possible if she mistook a twin for yolk sac. I don't remember seeing the yolk sac in my first two pregnancies. I'm 10 weeks 3 days now and have my next appointment this coming Monday but it's not for a sono. What do you think?