Do you know how many days pregnant she is?
Is the color a dark green?
Have you seen any abdominal contractions yet?
They are pregnant for 63 days. If you think you're close to that and she is having brown discharge, that may be some mucuous. If she has milk in her mammary glands, which you can check by milking one of them, she may be within a few days of labor. The dark forest green color is what color the placentas of the puppies so the color you are seeing sounds okay.
When she goes into labor, you will see obvious abdominal contractions and then you are in business. You should see a puppy in less than an hour after the first contraction.
You're welcome. Hope everything is okay - good luck with the puppies.