No yolk sac?

Kayla
Hey ladies! 
I need some advice and peace of mind. I'm currently pregnant with my first. The lady a few weeks ago told my I measured at 4 weeks based on my last menstrual cycle. My cycles are around 35 days. I went in today for my first ultrasound supposed to be 8 weeks. My doctor said I'm measuring at 5 weeks still early to see anything. There if no yolk sac. I guess I want to make sure it's okay and to stop freaking out. She has me coming in next week (6 weeks) for another ultrasound. Any of you ladies have anything similar?
Thanks! :) 

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