progesterone levels

Brittany
Just had first and second blood draw this past week, Tuesday and Thursday. Have not gotten Thursday's results back yet but on Tuesday, my progesterone level was 50.7. I am on progesterone suppositories (200mg once daily), and also this was my second round of femara. Am currently 5w1d. Was warned about multiples...what are normal progesterone levels this early in pregnancy? 
Currently have had two live births, and four mcs