Not Showing at 20 weeks?

I’m 20 weeks and 3 days and you can’t tell I’m pregnant. Some days you can see a tummy but the next morning it’s gone like bloat. For the past couple weeks I’ve thought I felt baby moving in there (pretty sure) but now it’s stopped. My pregnancy has been smooth sailing. Should I be worried that my stomach is small and I’m not really feeling movement? I’m so afraid for my anatomy scan coming up