I haven't had a period for 6 months (not pregnant). blood work showed <0.1 for progesterone and 80 for estrogen. are these levels normal or low?

Low: Estrogen and progesterone levels rise and fall during the month, so the time of the blood draw will determine what is considered normal. These levels indicate essentially no progesterone and an estrogen level that is the lower limit of normal, thus no period in 6 months. The next step is to determine why your levels are low. Nutrition, stress, thyroid, and high prolactin are a few possibilities.