Everything is so small yet at my 18 ultrasound they couldn't see the heart but it was clearly there cuz the baby was kicking and moving. Onve things get a little bit bigger I'm sure everything will show normally.
Yes it happends techs cant always see everything with my first pregnancy the tech said she didnt see one of my daughters kidneys and that she could only see 3 out of 4 of her heart chambers and when they went back for the level 2 everything was there she is now 7 years old and the biggest pain in the butt lol
I really wish I could help but I haven't experienced this. Prayers your way, sure the baby will be okay :)