5 weeks 6 Days no yolk sac seen???

Terree • Expecting My First Baby (Its a Girl!) Due 9.14.16 ❤😍
I got a second ultrasound yesterday & she told me she MIGHT of seen a yolk sac but I'm not seeing anything, she said I measured to be about 5w6d & that the gestational sac was growing so that could be a good sign, I have a Obgyn appointment tomorrow & I don't know if they will give me an ultrasound yet, but I just wanted to know if that was normal not to see a fetal pole or yolk sac yet? I am really worried cause I really want this baby 😢😢😢😢😢 (I've included both ultrasounds, the smaller one was my first) somebody please help!