In the first trimester, the normal values for progesterone levels are as follows: – 1-2 weeks: 5-50 ng/ml – 3-4 weeks: 10-90 ng/ml – 5-6 weeks: 20-150 ng/ml – 7-8 weeks: 20-200 ng/ml – 9-12 weeks: 30-300 ng/ml. These values are only general reference ranges. The actual situation may vary.