Declining HCG

If my HCG declined after 48 hrs, is it a chemical

pregnancy? I tested first at 150 then 95 after 48 hrs.

Update: HCG count on 2/1 - 150, 2/3 - 95, 2/15 - 279

Why is my HCG fluctuating? I did a TVS today and no gestational sac, no ectopic pregnancy. Will be doing an HCG test come Saturday.