hoping for the best. preparing for the worst.

My rainbow baby is making me worried. Based on my lmp I was 8 weeks exactly with my first us. They saw a health yolk and gestational sac but no baby. Doc scheduled another us in 2 weeks. She said there is a slight chance of mc but could also be where my uterus is retroverted and could be hiding my bean. Has anyone gone through this and could offer some advice??