plz pray.i dont want lose my baby

yes dr gave me tablets duphaston 10 mg twice, plus shots for progesterone. ive had 5 shots in all,( 500 mg ) each since 19 august.
and now the test is showing progesterone = 6.4 ng/ml which is vv low for 6th week of pregnancy.
and my hcg is dropping , last week it was 4730 . now the report says 3000
but its the progestrone im worried abt.