Hey Possums

Hope this helps!

Progesterone levels vary depending on when the test is done. Blood progesterone levels start to rise midway through the menstrual cycle, continue to rise for about 6 to 10 days, and then fall if fertilization does not result.
Levels continue to rise in early pregnancy.
This following are normal ranges based upon certain phases of the menstrual cycle and pregnancy:
Female (pre-ovulation): less than 1 ng/mL
Female (mid-cycle): 5 to 20 ng/mL
Postmenopausal: less than 1 ng/mL
1st trimester: 11.2-90.0 ng/mL
2nd trimester: 25.6-89.4 ng/mL
3rd trimester: 48.4-42.5 ng/mL
Note: ng/mL = nanograms per milliliter