What Does Fluctuating Hcg Levels Post Miscarriage Indicate?

I have a miscarriage the 16 of this month not a lot of blood but I still feel pregnant my belly look like it is still growing I don t have no d&c it was a natural miscarriage and my doctor didn t get me a follow up just one blood test on dat day and seh it is low he never tell me how low it was and did 13 of February is was 998 on and did 16 of February it was 636 then I did one and the 16 of February that same day but they said it was low did not get a number can I still be pregnant