So based on my lmp I should be 6 weeks 5 days, I had my first ultrasound for size and dates and the sac popped up right away measuring at 5 weeks 3 days. Kinda saw a yolk sac very blurry. I'm scared the "baby" stopped developing because we didn't really see anything. The tech said there was nothing to worry about but I still worry.  My progesterone levels were low last week and I've started taking pills to bring it back up. Has anyone had just the gestational sac show up at 5 weeks and had a healthy pregnancy and baby?