Hcg at 16 weeks

Ashleigh • Mommy to a beautiful babygirl my 🌈..*1/9/18👼🏻*1/23/20👼🏻👼🏻*

Has anybody had there hcg checked this late in pregnancy unsure on why they checked it but are levels supposed to drop? A month ago I was 121,000 now I’m 21,000 is this normal?