Getting worried

Tiffany • Christian. Mother of 3. 3 living and 1 angel. 10 years together married 7.
I had my ultrasound today. We could not see baby at all, not even the fluid. Just the thing lining of my uterus. I'm getting worried because everyone else around 5 weeks sees at least the fluid. I go back again Tuesday to check HCG levels, and go the 22nd for a ultrasound. Anyone else have this?