It sounds like it's urine probably that happens to a lot of women. Amniotic fluid usually smells sweet or like semen. I had an amnio done and it looked urine color to me however I hear it can also look clear.
Amniotic fluid I'd just wet it's not think or sticky to the touch like discharge. If it has a sweet smell its most likely the fluid and not urine. I would call your dr or bring it up when you go for your scan. Good luck!
my doctor says it is clear and thin like water.